I'm sure he has an excellent plan, Jenny, but without the support of the electorate, it will get nowhere.
Firstly, to rejoin, Brexit will have to have proved a failure. Secondly, you have to factor in whether countries like France would want us back anyway, after Aukus and other developments and perceived sleights on the way.
This initiative will fall at the first hurdle, so put your enthusiasm into this folly if you like, but I wouldn't part with any money if I were you.
We have escaped from the claustrophobia of the EU, and there can't be that many suffering from Stockholm syndrome. The young people who are indoctrinated at school and university will grow up eventually when they have worked in the real world and start thinking for themselves.