I'm a no as IMHO it is a non starter, it's a nice enough fantasy but it is fantasy.
There are hundreds of decent time share resorts in most of these places. To be worthwhile for Disney there has to be a big enough profit margin in it for Disney, with so much competition it is unlikely to have enough margin for them to get involved in what, basically, would be a new venture for them. Disney is a profitable organisation but a good sized development would be 10s if not 100s of millions of $s. Both Vero and HH had very slow sales and IF any more DVC resorts are to be built I would think DLC is the ONLY non WDW site that is a possibility.
My personal reasons for voting no ( other than it is just not going to happen) is that IMHO more of those owners ( DVC Carribean) are going to want to go to WDW than people are going to want to go to the Carribean whose home resorts are at WDW. Therefore there is going to be more difficulty in trying to get less than 7 month in advance bookings. Both HH and Vero can be used as "add on" stays to a WDW holiday, a Tropical Island resort would by definition be a seperate destination there is no connection with Disney and IMHO it would be a waste of resourses. There are plenty of opportunity to swap a DVC resort for one of the many fabulous non disney resorts for those that wish to do so.
I don't see ANY advantages to the idea and plenty of disadvantages, sorry to burst your bubble.