The reason people use Uber or Lyft (disruptors) is because they the provide an easier and cheaper way to hail and pay for transportation of the type Taxi's provide. You fly into an airport in a new city, you whip out your phone and get a cheap, efficient ride for less in a few minutes. Taxis still exist, people still use them, taxi infrastructure still exists, Uber and Lyft might at some point completely replace them. Self driving cars you can rent by the minute might replace private ownership of cars at sometime too, as well as replacing taxis, Uber and Lyft. Technology in this case can significantly change how we do business and live.
To "disrupt" the timeshare industry (which includes several distinct bits), you need an easy, cheaper way of doing those bits. Deeds which are subject to huge amounts of state, local and other law, don't seem to me to be ripe for any type of unified system to take them over. While it would be lovely to have a simple, cheap and unified system to handle deeds, inserting blockchain on top of the existing system, doesn't seem to make sense to me.
I could see rentals - where trust and money in both directions - matter, could benefit from blockchain, however, RCI or II could just implement their own secure payment system on top the existing structure and continue on. Creating a new exchange means getting points deposited for enough properties that people want to rent other properties of. It looks like there already has been some consolidation and the big timeshare companies, who can control how you deposit points, aren't gonna let people go to a new exchange without serious obstacles to leaving.
Same with resales, A unified resale market does not depend on having a new transaction type. It depends on having a market for the resales. Blockchain might be a benefit, but it wont create the demand.