I don't mean this to sound like I'm flaming anyone, but isn't Mission: Space already a reality? Unlike everything else on your poll, they are actually building it.
Now, if you're talking about how much extra time they'll need before opening (and God forbid it isn't two extra years), then you bet I'm for them finishing this pavillion over anything else.
I was just at Epcot and they've got enough there to get me excited already about it. I hope it ends up being as cool and cutting edge as it they are making it out to be.
Personally, I'd prefer it if you added the other rumored attractions, like Indiana Jones Adventure, or some derivation of a Matterhorn for Epcot, as well as a "Soaring Over..." attraction, as well as the rumored Weather/Air Pavillion that keeps getting mentioned as a possible new Pavillion between "Sea" and "Land."
Actually, I REALLY, REALLY want them do finally do something with the Submarine lagoon and it's hidden ride staging area (at both MK and DL). Right now both "ponds" are just wasted space. And, sadly, there doesn't seem to be a glimmer of a real new attraction for these spaces for either coast's "Magic Kingdom." And for years now we've been told that they will be putting something new into the space sometime in the future.
And this makes me worry because the old Cop/America Sings building at DL sat empty for close to a decade before they finally installed a mini-version of Innoventions (and there's rumors that they may shut it down due to poor attendance--no one I know ever goes in there).
