Wishful thinking. First the EU needs to change itself so people will want to re-join. Rather it seems that the EU is going opposite direction. After Covid era, I guess no sound person trust its institutions anymore.
Already happened. From the fine article:
"60 per cent of Britons now think Brexit was the wrong decision and would vote to rejoin the EU at a second referendum"
And young voters are just a tad more lopsided:
"Young voters are the most pro-EU of the lot, with 79 per cent of 18- to 24-year-olds wanting to rejoin"