Regarding the concept of still visiting the pavilion/ride even if some of us don't like it; I don't really begrudge anybody being curious about what's gone into a space formerly occupied by something one might consider superior, more thematically appropriate, etc. It honestly does not make that great a difference.
What makes me sad, however, is that this may (just may, nothing's definite yet) be the nail in the coffin that kills some of our dreams for a return to form for EPCOT, which makes wanting to visit the park in general a less appealing proposition in the first place. I know EPCOT's been struggling for ages now, it's unavoidable, but there is still a skeleton there that something really interesting could be built onto. A move toward ideas like this, instead, seem to signal a full retreat from that, and it stinks for long time fans who often looked forward to EPCOT the most out of all the WDW parks. Maybe I'd go see what the new ride is like, but I feel like I'd have a difficult time shaking the feeling that the park I grew up loving is really gone. When I think of all my favorite WDW rides and attractions, both historical and current, it strikes me how few of them feature familiar IPs that came from sources outside the park...some of them are certainly still there (e.g. Splash Mountain), but they're a clear minority. As I said before, there will now be an entire park devoted to that, plus there's more and more space at MK and now AK devoted to that, so the sense of "I'm visiting EPCOT because I like the change of pace" just won't be there are much.
Again, nothing's definite; tons of plans might change, who knows what could happen between now and, say, 2021. But it just kind of hurts to imagine "this was one of your absolute favorite places for just about your entire life, but there's now going to be very little of it left, and it'll just be like everywhere else, instead." Nothing else to be said because it's just a subjective feeling, just stings is all.