I like Walter but I hate when old Muppets get a backseat to the new ones. I now consider all the Muppet Tonight classic Muppets but when MT first came out I remember thinking where are all my Muppets? It's easier to appreciate new character when you don't think their stealing screen time from the others. I grew up during the Gonzo/Rizzo era so I miss the Rat and to a point Gonzo, I hope he has a much, much, much, much, much larger role in the new movie.
Yet don't get me wrong i'm a huge Walter fan, I was a fan of his even before the movie, he put Disney in their place when he commented on the Season 4 & 5 DVD release of TMS. I'm really glad he's stuck around, I love knowing their is a Muppet just as obsessed with the Muppets as we are