If Johnson has no chance of retaining Uxbridge and South Ruislip, which seems likely, it is interesting to think whether there is another safe seat he could go to and whether there is actually anywhere safe enough for him that he could go to.
I assume he wouldn't be advised to go anywhere in the South East where the Liberal Democrats are in second place.
If he is thought to be vulnerable, Labour would flood the seat to try to take a big scalp, LibDems would offer token campaigning because, even if the Conservatives remained the largest party they would be deemed to have lost, simply because they had lost their leader.
If he tries to go to another seat, he will be accused of cutting and running, it won't look good. There is then the question of which constituency would take him. He is not a traditional Tory so many party members may not be exactly keen - to what extent would they want to campaign for him, particularly if it means a popular MP stands down. He doesn't have roots in any particular part of the country (except London). Two constituencies with majorities over 20,000 there are Hornchurch and Upminster, and Orpington (interestingly, formerly held by a Johnson, and once the scene of a famous by-election victory). Anything less would be risky.
Personally, I think Mrs J would have a word and suggest he would want to spend more time with his growing family and the 'after dinner' circuit. And, in relation to the former, I wouldn't be surprised if we didn't hear an announcement from No. 10 within the next few months; anything to get on the front covers for positive reasons.
Yes, at the time I thought it was rather bizarre timing given they would probably have more ammo after these results.
Maybe polling at the time indicated better?
Maybe some pro Johnson MPs put letters in to get it over the line so the vote happened before the by-elections?