Yeah. Given the European adventure aspect, I don't think he would've found it necessary to have himself in the movie for anything beyond a cameo anyways. He probably would've been down to shoot a cameo, but this will be filming right during the busy timing of HIMYM filming. I think it'll be cool if they don't have a human main character and just have fun cameos at every turn like the old movies.
For shame. Granted, I'm a huge Muppet fan, but it's genuinely a great movie.
I guess I'm just indifferent to them. I might finish it today.