These were all really good choices. I originally was going for the tomorrowland refurbishment but now that I've thought about, I'm going for Westcot. I really think that this could've turned out to be something great. Just imagine, an Epcot for the West coast. So many pavilions, so much potential. As for the others:
Beastly Kingdom: This would've been my second pick. Too bad Universal had the lost continent too contend with so it wouldn't look like they were copying them.
Discovery Bay: Again, interesting concept, so much potential never used.
Disney's America: Out of all the options on here, this could be theoretically built at any given time so I wouldn't be surprised if something similar to DA happens down the road.
I voted for "Tomorrowland 2055 refurbishment" because (Disneyland's) Tomorrowland has been pretty static and uninteresting since the '98 refurb. After the '67 refurb, it had a lot of movement and excitement; not so much, now.
Agreed JB! The so called refurbishment of the late 90s proved nothing more than to be a disappointment. It really needs to be updated for sure!