The problem is in 5 years time we will end up with just that, a rabid right wing populist movement fueled by 'sensible' people in suits 'talking down the working man' as stoked up by Patel/Braverman etc.
Imagine getting annoyed about Corbyn still, he is a complete irrelevance. And the idea that he is going to start a new party appears to be made up in the OPs head.