I didnt care for the title of the thread either; however if the question were rephrased as "What would happen in Johnson resigned" [which in effect is the same]
Presumably there would be a new leadership election, with Raab in temporary command [god help us] in the meantime!
I suppose the wider question is, who would those on the Blue team vote for , if they had a vote in the matter? Raab? Gove? Patel? Rees-Mogg? Hunt? [came 2nd last time, remember], Hancock? Grayling? [j/k] - and depending on who was chosen as leader, would there be any change in the Covid policy (in either direction?)