As noted before, Mick Foley is scheduled for hip replacement surgery within the next couple of months and he was basically written off of WWE TV last night.
Dave Meltzer suggested on the most recent Wrestling Observer Radio that it looks like it will not be a short term absence and Foley is indeed gone for good.
Meltzer and Bryan Alvarez also speculated that Foley’s surgery is not scheduled for until after WrestleMania so there’s a possibility he could make an appearance at the PPV to help Seth Rollins in his match against Triple H.