Not having an election when Blair resigned was a major error. So was it when the same mistake was made when Callaghan replaced Wilson.

I hope Theresa May makes the same mistake, and gets the same result - defeat at the next election.

It's a bit more complicated this time, since the law now insists there can't be a fresh election under five years, without two thirds of the commons voting for it. But of course the law requiring that can always be repealed on a bare majority. (We really do have remarkably bent constitutional arrangements - for example, there's nothing to stop a government with a reliable house of commons from extending the life of parliament as long as it wishes...)