When will the bottom of the barrel be scraped no further? Only the Tory party can decide

On the news round:

” … Johnson was dialling in from a farm just over the Devon border, where he was campaigning and simultaneously hiding over the weekend in the run-up to a by-election in one of the safest Tory seats in the country, which he looks set to lose after one of his MPs was caught watching porn in the House of Commons chamber. 

If he loses that, it could be the end of him, but it’s not up to us. Only the Tory party gets to decide when the bottom of the barrel can be scraped no further, and you wouldn’t like to bet how far down the U-bend they’re prepared to follow their leader. …”

www.independent.co.uk  (extract)