You can thank BLT selling as fast as it did for that. Our now retired sales rep for DVC points who had been with Disney selling DVC since less than a year after its inception was telling us all about the proposed River Country DVC. Then when BLT started selling like hotcakes, there were a bunch of surveys sent out to figure out WHY it was selling at a much faster rate than other properties. Overwhelmingly according to him (like upwards of 90+%) of the people chose monorail versus cost. As in they were willing to pay more to be on the monorail line. This of course set into motion the GF DVC and now the Poly DVC.
With that info, I wouldn't be surprised if the OP was right about another tower being built at the Contemporary replacing the garden buildings.