Count me in for a 60th anniversary TV special. I'd love to see a two-hour retrospective hosted by Jimmy Fallon and/or Jimmy Kimmel (two of the Muppets' best friends on modern-day TV).
I have to wonder how Jason Segel would work as a host or co-host for such an endeavor - I know he stepped back from it all after TM2011 but I can't imagine that his heart wouldn't be in it for something like this.
After reading Jim Henson: The Biography, I started thinking that there should be a book or documentary on how the Muppets have survived - and even thrived - as a franchise after Jim's death. That they are still present (and in many corners, treasured) in an increasingly-crowded pop-culture world is a tribute both to Jim's legacy, the enduring appeal of the characters, and the hard work of so many people that have kept them going before and after the tragic losses of the early '90s (ie. Henson and Hunt).