Brian you are wrong, really wrong.
My Tory councillor son is now becoming worried on the recent bout of door knocking. People who abstained from voting Labour in the last election are now going back to Labour for two main reasons.
The first and most common reason is that the fear factor of Corbyn is now gone. Corbyn may have been a nice old grandad type of guy but his policies scared the living daylights out of loads of people. He just was not 2020 material and his departure from the scene has brought a lot of old supporters back to Labour.
Secondly, Starmer is coming across better than expected and him being a pale Tory is taking some votes away from the Tory party. This is what Blair brilliantly did in 1997.
The days of the Tories being a dead cert to win the next election is no longer guaranteed.
Starmer made it clear that he wants and, indeed, expects an exit agreement on Brexit to be concluded by the end of the year and failure on an agreement will purely be down to incompetence of the Tories. This is good news for the old Labour voters up north who voted blue against their natural instincts. The "borrowed" voted is now more likely to slide back to Labour.
I suppose this is good news for most conservative type voters as both Labour and Tories are now becoming to look like twins, they will get the Tory policies what they want no matter which party wins.
However for the hard left, it is now certainly game over as Corbyn totally blew their chances for a long time to come. He did as much to destroy socialism as Margaret Thatcher did.