In terms of the possibility of the "wandering" characters...I miss this! It was really fun to see that at DLR, it lets guests feel a little more "in the magic". That being said, if it's supposed to be a M&G (which it NEEDS to be), not having a building makes it nearly impossible. Wandering characters at DLR don't stop or sign but you can go along with them. Green Army Men already wandered but would stop for pics, sign, interaction...BUT now I'm remembering that in the earlier 2000s when Jessie Woody Buzz met outside Al's Toy Barn, they didn't wander, yet had a specified area. And that kind of thing lines up w/ how MOST character M&G are at DHS, like Donald/Daisy, Goofy, Storm Troopers...
Yup, just talked myself into a circle. Score one for Disney on the confusion/speculation game.