Well that's the big debate really among fans, hehe. Which is fine, nearly every big franchise has these never-really-resolved-debates that serve to keep the thing alive, hehe. For my part, I don't see perferring the past as "undaring", I just see it as recognizing the best work. But I won't quibble, I think there's room for both.
My concern though is, I think the past Muppet projects have nearly gone out of the public consciousness in recent years. The Muppets have not been given the respect so many other classic forms of media have, for several reasons. One, older media in general is getting a bad rap. But also, there's been a lot of attention placed on putting out newer Muppet projects (that have not attracted the same huge followings) and not enough attention on perserving the older ones.
It's the people behind the Muppets' responsibility to keep the past work alive, Jim's work alive, and I don't feel it's happened. I'm not saying it's anyone's fault, I think they are trying their best. But it's hard out there right now for classic media, and even more so for the Muppets.
The newer projects have had many opportunities to reclaim and it hasn't happened. That doesn't mean it won't ever, I'm open to the idea. But I'd prefer for there to be some balance between the old and new.