Okay, i have a new theory about where Steve is - it's completely whacked-out, highly unlikely, totally out-of-left-field but it's certainly better than a lot more somber, worry-inducing realistic ideas running through our heads at the moment so if this eases anyone's mind for a brief milisecond or makes someone smile for the first time when thinking about this whole situation so be it...
When all is said and done, maybe this will all turn out to be one huge multi-media cross promotion with Boom!'s Muppet Show Comic Book which currently features a Kermit imposter skulking about the theatre. Faux Kermit is going beyond the comic pages and actually making his way onto the tv screens fooling his colleagues (as on AGT) if not totally convincing the hardcore Muppet fans in the audience and also engaging in some rather extreme unlikely endulgences like stepping out as Lady Gaga's VMA date (while "real" Kermit was at D23 the same weekend).
Then down the line, Faux Kermit makes one more appearance on a big highly rated tv show and midway through, the real Kermit inturupts him demanding to know what he thinks he's doing...and the audience learns that they can read about what's been going on with this rogue Kermit in the latest issues of The Muppet Show Comic Book. No one is commenting on where Steve is so as to not spoil the surprise and indeed allows the fans to generate buzz that works its way into other blogs or entertainment news sources about how Muppet fans are panicked because they've noticed an imposter Kermit! Steve comes back out of hiding with the real Kermit (which will coincide nicely with the release of Pegleg Wilson #4) and all is right in the world again!
...Just a guess...don't mind me...