The Tories, like Putin, see the virtue in power and we know what Putin is prepared to do for power. The Tories are of the same character. While they believe Johnson can win them the Red Wall seats and, therefore, a majority, they will keep him on whatever he does.
They have already abandoned their core voters. It is the Red Wall or nothing. Hence the recent debacle over the Rwanda Solution. It matters to individuals that this is a hateful suggestion that will cost us billions if it goes through. That doesn't matter to Johnson. Why? Because it will win Red Wall Votes. The Party will see this and, appalling though he is, he will stay.
He will only go if he loses Red Wall seats in the local elections. No matter that he will lose votes from conscientious life-long Conservatives. Their votes won't give him the majority the party bought him for. And bought him is what they have done. In many ways, he has and will cost them dearly. They will lose the votes of the young for decades - but they will look for another Johnson to appeal to them. And the staid old lifetime Tories will always be there to pick up the tab.