They already blew 2 opportunities — January 2013 and 2015.
It is difficult to think they will do anything other than bluster to the media.
GOP did not have control of the Senate in 2013 so there was no good reason to dump Boehner because the focus was on Harry Reid.
And the ‘they’ that you speak of were not identical ‘theys’ in 2013 and 2015.
New members like Mia Love could have, should have voted to dump Boehner in January 2015 but that’s easier said than done.