Who will control the house in 2015?

[Talleyrand]

I would wager Republicans gain upwards of ten seats, judging major changes in the political landscape over the next two years. If Democrats couldn't take the House in 2012, despite a fairly decent year with a popular vote victory occurring, I simply don't see a realistic scenario at this point that has them gaining seventeen additional seats to attain that majority, let alone any at all (although that would be much likelier).

I doubt Boehner will step down unless it's clear he would struggle in a leadership vote or dissatisfaction with him reaches a level too distracting for him to hold on. That probably means he'll be gone in 2014 or 2016.