From where I sit, the question will ultimately come down to whether Disney feels that the concept of creating quality Muppet material and being known as the studio that kept the beloved Muppet franchise going trumps the sting of a less-than-stellar box office performance for MMW.
Think back on the past year's Muppet output. It would be one thing if all that we - and Disney - got out of this was a great Muppet movie. But the advertising tie-ins proved a couple of very important things:
(a) Major companies are still willing to join forces with the Muppets to sell their products (the Toyota ads ran in North America for a good two months after it was clear that MMW wasn't going to smash box-office records); and:
(b) Even within the limited framework of advertising campaigns, amazing things can happen with the Muppets. That "Animals in New York" Lipton Tea ad is a piece of genius and deserves its place among the Muppets' all-time best work.
We may not see a theatrical movie for awhile yet, but I'm cautiously optimistic that we will get one, possibly in 2019 or 2020. But I think that the Disney suits and the creative team alike are aware that a third movie mining the TMS vibe won't do. I dearly hope that the next Muppet movie project, be it theatrical or direct-to-video, restricts its focus to one or two specific characters (or a fixed group like the Electric Mayhem) instead of stuffing as much of the cast as possible into a 90-t0-120-minute format.
In the meantime, I recommend a regular stream of virals with the hopes of some sort of TV relaunch. Virals are relatively inexpensive to produce but make a huge impact in the social-media landscape. (Think of the Cookie Monster and Kermit ALS ice bucket challenge videos, how quickly they came together, and how much people love them.)
Just DON'T WASTE THE MUPPET MOMENTUM, Disney.