I wouldn't mind seeing a Super Grover movie of some kind. There's a lot of things they could do with it. Plus, it seems Grover is rising up again to popularity. Not that he was ever unpopular, but he seems to be used an awful lot lately.
As far as the Elmo's World movie...that could be pretty good if done right. I mean, it's true that there was already a major motion picture centering on Elmo, but if they featured enough of others, then I could be fine with it. I just wish they'd do another movie like Follow That Bird which could be enjoyed by a larger audience. I mean, it was sophisticated and entertaining enough for anyone to enjoy really. Elmo in Grouchland wasn't terrible, but it wasn't amazing. They should also feature the adults more too. I mean, the Muppets are cute and all, but them mixing with the humans makes it ten times better.