I know the system is new and confusing, but I believe this is a lot of disinformation.
1. Separate ENROLLING from USING points..
No problem in theory, but enrolling is an exense that must be paid.
2. You can join the Marriott exchange company and not USE points..
Then why pay $700 to $2000 to join?
3. You will still have access to flexchange, interval getaways, other resort groups and direct access to II per Dave M's post above..
If that is true you are paying marriott $165 for something you can get from II for $89 plus access to some imaginary points who's value can be changed at any time for any reason. If you no longer have direct access even a worse deal.
4. You will be able to do everything you do today only you will pay your fee to Marriott instead of II, and the fee will be lower if you do anything except reserve your week. This will of course change over time, just as it does now..
The fee is NOT LOWER unless you exchange EVERY year. You save $76 every year that you use your home week if you are in II over Marriott. Every 2 years you have save more than the annual Marriott fee if you use your home resort. In addition the REAL cost of the points Marriott skims from your deposit oftent times will cost more than the II exchange fee and lockoff fee combined, so rather than a savings exchanging using points will likely be an added expense!
5. You NEVER have to use points if you do not want to..
No reason to join and pay $76 more a year then.
6. If you don't join you will pay your current fees and not the new Marriott fee. For most this will be higher. You cannot avoid the trade implications because the trading will be effected regardless of your choice. It is a fee choice. Which option is cheaper for your usage?.
Depends on how often you exchange and whether you can actually still get like for like trades using II, something you can't do with Marriott because they skim your annual points.
7. You do not have to buy any points..
You do if you want to use points to trade for resorts that have the same point value as what you deposit, and you have to buy or borrow more points to trade into your own home resort on any year other than your use year.
8. You give up your voting rights to work against the points system, which is only logical. If you wish your resort to change managment companies then you will cancel your Marriott exchange membership, become a weeks member again, and vote your conscience and try to influence the HOA..
Marriott is telling you up front that you won't like the way the points system is run and you won't vote for what they plan to do with the system, so they are going to vote your vote as they see fit and that is understandable and acceptable to you? Really?
9. If you do not enroll then you will lose the option to trade for exchange points. This can be a critical flaw if the change is successful and the weeks inventory becomes depleted either through people converting or Marriott giving preference to points members..
Yes the threat of your week becoming worthless except to use at your home resort is their sales threat, and a real possibility. They can't sell the points on their own merit, so they resort to fear mongering to make owners convert. Whether it turns out to be true or not, i will not be forced to pay extortion by Marriott. If my week becomes worthless, so be it.
10. The enrollment fee is nominal for developer buyers and reasonable for resale buyers and is currently financially offset by an incentive. It is trading money for services, but Marriott has the services to provide at a lower cost. Similar to trading money for MR points incentive in the past. You have to take more vacation to obtain the benefit which can be a good or bad thing

.
$1995 is not reasonable, it is a huge percent of what I paid resale. It also give Marriott my vote,Marriott access to my week, and all I get is some of Jack's Magic beans,oops I meant points with zero real dollar value as my bonus.
11. If Marriott changes things in the future that you do not like you can go back to being a weeks owner any year you choose..
And be out $1995, have the results of anything they got passed using my vote be irrevocable, and not get any refund or compensation from the $1995 I paid for a program they changed AGAIN with no input from owners. No Thanks.
I can see no reason not to enroll unless you are an occupy only owner of a fixed week, a weeks owner who maintains an II account but only does something once every few years and is happy if they can reserve any week in season, a resale owner who does not want to pay $1,995, or if the $700 fee is something you cannot afford.
Much as people wish things would stay the same they will not. The exchange sytem will change independent of your choice. If you don't enroll you will lose the opportunity to take advantage of the opportunities that the new system presents. If you do enroll you will have the same exact opportunities as people who don't enroll, plus further options.
I can see no reason to enroll other than to hope to get better trades than will be given to people who don't convert. You pay more per year to Marriott than to II. You get less points when you deposit your week than they charge you to reserve it or one like it. THE VALUE OF THE POINTS THEY SKIM EVERY TIME YOU DEPOSIT YOUR WEEK CAN EASILY EQUAL $400 ANNUALLY WHICH IS MUCH MORE EXPENSIVE THAN EXCHANGING THROUGH II AND LOCKING OFF YOUR UNIT EACH AND EVERY YEAR. COUNTING THE SKIM EXCHANGING THROUGH MARRIOTT IS MUCH MORE EXPENSIVE THAN EXCHANGING THROUGH II. Marriott takes your vote and vote it in marriott's favor, They basically threaten that if you don't convert that eventually your exchange options will be limit in order to make you convert. They will charge anyone who buys your week resale at least $2000 to keep it in the points program killing your resale value and negating the $1995 spent to make it points in the first place. You will never ever uptrade in points. Your will never be able to trade like for like thanks to the skimming. They can change any parts of the points program or the points values at any time and yet we are supposed to trust them to change it in a manner that is good for owners?
I know you like it, but I still don't see why.