With the rumors and whatnot, I'll admit I do like Dinoland U.S.A. So I would be a little bummed if it did go away.
Now with Dinosaur, I honestly do enjoy it. My very first time on it was in the front row, so it was a very memorable first time for me. I've always seen the ride as a supercharged Classic Dark Ride which is more about darkness/blacklights and lots of surprises. Though I do wish it still had the ride profile/sound design of Countdown to Extinction which apparently was way more intense.
If Dinosaur was replaced with a IJA, considering IJA is a great attraction with more elaborate/better theming, I'd be a little bummed at losing the Dinos...but on the other hand I know it's being replaced with a great attraction so no complaints there.
As for South America possibly replacing Dinoland U.S.A., I'd be quite fine with that. There's definitely some possible trails you could put in the land for it. Also, I'd be all for them flattening Dinorama for some kind of boat/river adventure. (I'd also say a river safari like what was orginally planned for Asia, but that would probably need the space Kali occupies with the bounty of backstage behind it.)