I'll miss the old PI regardless, but if it becomes a bunch of non-Disney restaurants, clubs, and shops (like West Side) rather than more Disney-run/themed places (like Marketplace), I'll be much less interested. I go to Disney more for
Disney stuff, not so much for non-Disney. I enjoy Wolfgang Puck Express, Earl of Sandwich, Virgin MegaStore... hmmm... Cubby likes Wetzel's Pretzels... but most of what we like is the massive Disney Store, the Disney cooking store, etc. I am interested in the
theming of the T-Rex restaurant but if the food is anything like Rainforest Cafe's

then I'll be sorry.
We have enjoyed Fulton's (for lunch; we were less impressed with dinner), Portobello, and I very much miss Fireworks Factory

(which, arguably, was one of the more themed PI restaurants, and while run by Landry's like the others, I think, still had its own PI backstory involving Merriweather Pleasure, the founder of PI)... Cubby liked House of Blues (it was OK for me, still a tad pricey) ... I am sure we will love Cirque du Soleil when we see it though I almost count that as Disney

...
But the vast majority of non-Disney stores, etc. don't interest us as much. I don't like the idea of Disney Stuff being replaced, Borg-like, with Non-Disney Stuff. I can get Non-Disney Stuff all over the place, after all!
David