The reason Boris won such a big majority was far less to do with Brexit and far more to do with Corbyn; and don’t forget that Starmer supported Corbyn along with many other Labour MPs. Oh, and so did “you lot”.
The Tories have done a dreadful job and I doubt they’ll win the next election, though I wouldn’t underestimate Labour’s ability to shoot itself in the foot.
If nothing else, however, Corbyn’s now finished and if Labour moves back to the left they’ll be as well. Love or hate Blair, he knew how to win elections.