If it makes you feel any better, Disney's Million Dollar Arm opened with incredibly poor box-office results, at only $10,000 in it's ENTIRE opening weekend. It seemed to have suffered standing up against Godzilla, the same way MMW disappointed when it was up against Divergent.
That being said, I think Disney realizes not all of their movies need to be blockbuster juggernauts, and if low-cost franchises like the Muppets continue to bring money for the company (especially during slow months like March) they'll continue to do things with them.