We are in a very difficult position now as Johnson is going to have to be basically physically dragged from office. Unfortunately this is exactly what he wants and indeed needs for the framing of his historical legacy of being PM. If he were to just resign now, in many years time when he dies it will be reported as 'former PM Boris Johnson died today, he was forced to resign in 2022 after being caught lying about......etc, etc'. What he wants now is to leave number 10 in a way no PM has done before to feed his narcissistic ego around him being special and better than everyone else.