I think there are many different things that play into what level of impact the new 'upgrade level' fees have on an individual MVC owner. Some it may have little to no impact based on their usage patterns, while others it may have a larger impact. Some may say this is more 'fair', while others may say 'unfair'. I can see both sides. For me personally, it will certainly change how I have been using my weeks in past years....not towards the positive.
I own two 2-bedroom Marriott Grande Vista weeks. Since enrolling in the DC Pts program, we have been locking off and exchanging through II without additional fees (lock-off, exchange, etc). This has really made our annual maintenance fees/club dues (~$2,700 total for both weeks) go a long way from a value perspective. Very attractive to us.
In the past three years, we have had 9 II exchanges into other MVC resorts with 13 total 'upgrade levels'. Not one of my exchanges was for a same size villa. Some were exchanging a studio into a 3-bedroom (3 upgrade levels). While some may say that is unfair, I would say that hard work paid off in fair trades based on villa size, season, and availability. As an enrolled owner with no additional exchange fees beyond club dues, this would have costed me $1,287 more or $144 per exchange. If I do 4 exchanges in 1 year, that is on average $576 more at the same annual rate. It will not break the bank, but is not an insignificant amount either. My II exchanges will still provide solid value, just not as great of a bargain as before. Others may be better off or worse than me, but I expect many usage patterns to change based on this 'upgrade fee'...especially for those who aren't enrolled and still paying II membership, lock-off fees, exchange fees, and now upgrade fees.