They will, count on it. (IMHO, of course.)
The ONLY way Boehner will lose the Senate Majority Leader job is if there is a big scandal that he covered up or perceived to have covered up OR he loses the House to the Democrats.....or of course if he retires. But now that I think about it Nancy Pelosi is STILL Minority Leader so maybe Boehner is in the job until he wants to leave...