//If Boris resigns or is hoyed out, the next PM might want to call an early election.//
The question, though (which I believe has been asked before) is why on Earth would he or she do that if there was a fairly good chance of defeat? Assuming the election was enabled under the "two thirds" provision of the Fixed Term Parliament Act (and not under a vote of no confidence which would require about 40 Tory MPs to support that vote of no confidence in the government formed by their own party) that vote would need around 150 Conservative MPs to vote in favour of dissolving Parliament when many of them may well lose their seats. The new PM may prove to be one of the shortest serving in history and I don't think it's on, somehow.