You're right in a lot of cases there, but I think it's kind of weird to have a Muppet fan as a main character in the Muppets. I just feel that Walter had his story already. His purpose was to bring the Muppets back together in one movie. His purpose was to be a big fan like all of us, and do what any of us would have wanted to do in the situation. But in a show like The Muppets, where does Walter really fit in? I personally don't see what he could do.
And I'm all for new characters. I love Denise! I love newer characters like Pepe and Bobo also. To some extent Constantine too (I prefer many others before him, but he's tolerable). But for some reason, I just don't like Walter. Like at all. He's not needed in my opinion. I don't think he has any thing special about him that other characters don't have. I find him annoying and he took the spotlight away from major characters in the last two movies. I think he was sloppily integrated into the cast, and forced himself in there. Yes, we can argue that he's the reason why the Muppets got back together, and yes he was. But that was just a movie. The Muppets never actually split up. So Walter's just kind of there now.
I'm thinking way to hard about this though lol. I don't like Walter, and I'm glad he hasn't appeared in the series yet.