I can't tell if you aren't aware he resigned or if your meaning here is that you figure Johnson will stand, be re-elected by his MPs and then pretend everything is back to normal, presumably while continuing to leak MPs to both by-election defeats and defections.

I wouldn't put it past Boris to attempt such a thing, but my guess is that it would be humiliating. There are dozens of MPs who'd back Boris in the hope of some reward, but far more see this as a useless cause and want to be first in line for a ministerial job under one of his rivals who might survive a general election.