As far as Muppet Babies goes not everyone disliked it, or dislikes it now. There were fans and there still are fans like me and others (mostly around my age group) who remember it with a smile

. I think, unlike many of todays shows, where they change a character's age,Muppet Babies did a good job of making its own world with a one of a kind feeling that was fun to watch.
A lot of the fan problems come from it being animated, the fact it didn't do much for the arguement that Jim Henson was a kiddy entertainer, and that it's non-canon... the last one is the only one I really have a huge disagreement with, since when exactly did the muppets have a solid canon, per se? Kermit said that the Muppet movie was only approximately how it happened, and I tend to think of the show as a "What if" situation.... And rewatching the series, it was clearly intended for younger audiences, but it had a lot of perilous situations... albeit, pretend ones, such as the Indiana Frog sequence when they were about to be crushed flat by the ceiling and that time that 1930's sci-fi villainess tried to enslave them.
The Rugrats Grown Up series on the other hand was mostly stories that had been done on shows like As Told By Ginger etc. You could have replaced all of the characters with new pre-teens (or teens, since those shows seem to think you should be one at nine now-.-) and it would not have changed much about it at all (the same might be true if Dora gets an 'older' series)...
Again, as I said, Rugrats all Growed up was basically a "What if" situation that somehow was justified into a TV series... I think it's a brilliant take on the fad of Babyfying classic cartoon characters the Muppet Babies to this day have inspired... Unfortunately, AGU was pretty much bland, and had a been there, done that (on Disney's One Saturday Morning twice) generic teen drama with the Rugrats's pasted in.
I still say doing the same with Dora isn't going to be as successful as they want it to be. With Rugrats, there was an audience outside of one target group. The show was pretty sophisticated for what it was, and even adults and older kids liked it. Dora has no appeal after 5 years old, and the only adults that watch it are the parents. Plus, the Rugrats had all these wonderfully complex personalities that manifested into their older counterparts in interresting ways... Chuckie's cowardice turned into reluctance and shyness, for example. Dora... really doesn't have much. She basically just asks the audience for help finding stuff? What can she find now? Her lipstick?
