Sure but if you take Splash and Pooh out of Critter Country what else is left? Essentially a pathway with a gift shop/candy store, meet and greet space, and a churro cart. Once Splash is gone it just doesn't make sense to have a land entirely dedicated to one ride. And if they remove Pooh it especially doesn't make sense. I am sure they are going to want to expand GE at some point and the limited possibilities and its adjacency to the current GE just makes it too easy to absorb in, unfortunately for Pooh.
The current Marquee isn't really a problem because that can extremely easily go away. If that whole area is turned into part of GE, likely that part of the queue would be "sealed up" and anyone who doesn't know would be completely unaware that there once was an entrance right there in the middle of the new modified queue.
Again, talking long term here. But assuming that space is reworked into part of GE, I also assume there would be new rockwork and maybe even a relocation of the current southern entrance. Point is they could be flexible with that space if they wanted to. They don't have to adhere to the existing layout/geography.