I just don't see how the Muppets of the "Post Jim-Era" have been jaded or immature simply because they've made some of the adult humor a tad more obvious...it's not like the kids notice (Jaded is the last thing that comes to mind when I think of the Muppets...and the only immature thing I can think of that they did is something that I've already stated many many times in the last couple of weeks...so I'm not going to say it again because I'm sure you're all sick of hearing it). And I don't think it's as bad as people like to make it out to be either...
I dunno, I simply don't get why it's such a big deal...as long as it's funny and goes over the kids heads (Again, many of the cartoons from the 90s...as well as ones on today...have adult humor far worse than anything the Muppets have done so far. And it flys right over the kids heads!) then I don't see the problem.
As for the Muppets having mature and deep bits, I really don't see what's wrong with that as long as they're still funny and heartwarming too...which, to me, they alway have been.
Again, I feel that my watching both Eras equally while growing up has given me a more open-mind view regarding the Muppets...allowing me to enjoy it all while the older fans can't because all they see are the differences (this is just how it comes across to me, I don't mean any offense by saying it). I'm hoping that the next Muppet project will be perfect for ALL the fans, and not disappointing in any way to any of us.