Frankly, out of all the things I said, I think this is the most likely one provided we aren't in a full out recession in 2042. Even with a YC
DVC, I could see this happening just due to how much demand the location has always commanded. (I think it originally only took about a year for BCV to sell out.)
The rest of this post is pure wishful thinking:
If they don't want to mess with the EPCOT sight lines, instead of a 10 story tower they could take over the nearby cash wing of Beach Club and make a wider building. Some way, they'll want more units this time. They'll also want to have Grand Villas with Lake and/or Theme park views to plump up the
point charts. Have standard view rooms as the first couple of floors/parking lot views to keep the entry level
point chart more attractive. I also predict that they'll put in tower studios similar to the Poly Tower.
They'd probably redo the Villa Pool to be a bit nicer (possibly zero entry with a sand bottom, but not super fancy to compete with Storm-a-long Bay) and have a themed splash pad for the kids. If they take over the cash wing at Beach Club, maybe that quiet pool would become the new Villa pool, and they utilize the footprint of the current one for more building space.
They could put in another restaurant/lounge like Topolino's that has views of EPCOT/Crescent Lake. You could move the character meal there to avoid the lobby chaos that currently is Cape May Cafe, and convert Cape May Cafe into a nice quick service location. Turn the quick service counter inside the general store into a nicer coffee stand/barista counter removes the morning chaos there.
Heck, I'd probably buy a fixed week Lake View Studio myself if that version came up for sale....