I loved Epcot, but also remember Epcot was not my favorite as a kid (still liked it, but wanted more rides). As an adult we appreciate it more, but we easily forget what it lacked. While some stuck on the past will never be able to look past Arendell, I think what FEA did for the Norway Pavilian has also been good - the theming is great, adds so much more, adds a more popular ride. Just imagine for a minute, if in 10 years, every country had a fun ride an the same level of theming Norway now has (yes I know not likely, but still imagine). The park would have a whole lot of traffic, and not lost it's theme there.
Now we have no idea what they have in store for GotG in Epcot, but there is potential. I think people could argue about it being anywhere, so if you get past that, and think about the potential it could bring, and maybe the possibilities of how Disney could tie all of Future world together (maybe not in same theme as now) that is still unique to the other parks, then you see there is potential.
I know some are hard to trust Disney, but I am not. I think Epcot is a lot harder park then anybody realizes. it was a great theme, but that ship has sailed. It just can't work, from having to get sponsors, to the constant updates needed...Disney realized it long ago, and while us "casual" fans haven't figured it out yet, I think many others have.