Don't think he's remotely interested (after the last abortive attempt). That said, you're making a good point - part of the Bojo problem is that whilst he lacks anything you might call Johnsonism as a clear political philosophy he has united a hugely divided party to the point they've got a thumping majority. A back bench leader risks them going the way of labour under Jezza, one of those already running but undeclared risks them getting behind a clear philosophy that distances a significant bunch of the existing party and current support and hanging onto Bojo risks more chaos. If he survives the dreaded vote their own rules pretty much give him a year unchallenged and fuck knows how far they could sink if he offered up a year of the same "leadership" (or maybe leadershit is a better word).
If you park any concerns about the country, economy or lives lost it's top-line entertainment