I do think Epcot is back on track. Obviously, there are lots of elements of the original park that I wish could come back in some way, but I think as of perhaps the last year or two (mostly post-Soarin'), the resurgence is there. I think the transition period, especially between 99-2003, was very rocky. It was unclear where the park was going, and sometimes replacement ideas were very poor (see the IMAG "fiasco"). However, Epcot is now developing a somewhat different image altogether and has support for it. It has become more the "fun showcase" of ideas instead of the look to the future. Sort of a "Future Worlds Fair" of sorts, and I think that works. The one thing that is still a bit "at risk" is the use of "fun technology" instead of fun for fun's sake. The character invasion could be a major threat to that, but we will need to wait until TLS especially to see how it works. They can be a great vehicle to the technology/concepts as long as they don't become the focus.
Overall, I think you guys missed the "rocky years." I personally think Epcot does not have the granduer and inspiration of EPCOT Center (with the exception of I:ROE - that show truly invokes the old spirit fully). However, the new attractions have their own flavor of fun, "in the middle of the action of how the technology works"-ion. The latter appeals to a much broader group of people and ages, something EPCOT Center unfortunately did not appeal to. I do think there is a place for the former in Epcot, and maintaining and updating SSE is a great way of doing so (as is maintaining and updating World Showcase). The timelessness of hope and inspiration is pretty cool, and having a ride in a giant silver globe isn't half bad either! That's my $0.02 anyway!