The fact that Zoot's been more chatty than Gonzo lately proves that Goelz is still on board.
There's an interview with Dave Goelz somewhere out there where he states his preference for the veterans to step back a little and let the new generation of performers and characters to carry on the tradition. That might be what he's doing. Gonzo's definitely around. Heck, Gonzo, Rizzo and Pepe carried the franchise in the 90's. I miss my Gonzo overload, but I'm really digging the increased Fozzie and Scooter inclusions.