Hey Cory,
I actually thought long and hard about your post before I responded to it. mainly cause I had to go to work but that was a good thing cause it gave me time to think. There are a few places I at first disagreed with you but actually found a middle ground that I think would make for an intersting film. First off, I think the Muppets are stuck with a real catch-22 situation. Do you push the envelope (and risk fans saying "but that's not the Muppets') or do you stay true to from (and risk fans saying "been there, done that") you have to walk a tight rope between the two. Case in point, MFS was supposed to be a 'return to basics' kinda film with the characters playin themselves but they also abandoned a lot of things like centering the film on Gonzo and ditching musical numbers and they got ridiculed for that too. Muppets Tonight faced similiar compliants. So what do you do? I don't know if the idea of doing a full-blown out fantasy film with fantasy villains (ie Skeksis-type creations) appeals to me because part of the Muppets charm for me is that they exist in this our world and interact in it. When you enter another creature type thing, you either a) end up entering in another design element I tihnk would clash with the deisgn of the muppets and look odd or b) end up placing the muppets in a fantasy setting thus subtracting from their reailty. However, I started thinking about some of my favorite things from MTI, like Blind Pew, the pirates, and old Joe from MCC and was wondering if maybe you could find a balance. I liekd that MTI's villiains were both human and Muppet. I liekd that there was mix of threats and I thought you could do a good design through the Muppet workshop that would walk that line. Let's say creating darker Muppets. you know likje a lind Pew or an Uncle Deadly kind of character. Furthermore, cosidering the amount it cost just to produce a Muppet movie plus the costs of creature shop creations, when you realisethat Muppet films traditionally don't do well at the box office, form a business standpoint I don't think it woul be a good idea.
I also don't think you need to go with a PG rating in order to get drama. Fiirat off, again part of the Muppets appeal is that they are meant for a family audience and when you add in that PG, you start subtracting half of you target audience. Second, I think that MTi and MCC were very dramatic stories in their own right with some very intense scenes and both of those held a G rating. I tihn one of the things that impressed me most about Brian Henson as a director wasthat eh wasn't afraid to handle drama with the Muppets and I think it worked quite well. I think people's problems with these two films was that it wasn't the Muppets playing the Mupets but rather the Muppets playing an already established story and characters. this brigns us back to the point about the Muppets trying to think outside the box. Realise it or not, both of these films were they're attempt to do seomthign different, to treat the Mpupets as actors and see how they handled roles and it's what they criticized for. So when yo think outside the box, you have to think is this soemthign our fans are going to like or not and that's a tough call to make.
I like your choice of potential directors. I kinda wonder what Spike Jonez would do with them considering the potentially dark tone of a lot of his work. Can I make another recommendation? How about Terry Gilliam directing a Muppet film? He has an extensive background in make-up, special effects, animation and puppetry. And most of his films walk a line between the dark dramatic and absurdly silly (ie Eric the Viking, Adventures of Baron Munchausen, 12 Monkeys). He's a member of Monty Python so I think he'd be very in touch with their sensibilites but his ability to set the mood of a shot would also be of great use in a more drmatic sense. I think he'd be a marvelous choice for a Muppet director. I really tihnk he (more than most others) would be able walk that tightrope between going in a different direction and remaining true to the characters. Anyway, that's just my opinion. I actually like a lot of your ideas, but liek I said I think you need to find that common ground between pushing the edge and staying tru to the Muppets. Anyway, that's my two cents.
--Matt