The idea that Boris the Liar, who is still being investigated, could return as PM is so perverse that it would probably happen, since it seems that if get gets enough MP support to be in the final two, so that members get a vote, they are likely to vote for him - so yet again an small cohort of middle-aged and reasonably well-off people living largely in the south of England make the choice.
Perhaps it would hasten the hammering in of the final nail in the coffin of the Tory party in its current form and hasten a GE.