Plenty of people won't, even fully vaccinated, CV is a nasty illness, I listened to Andrew Marrs description of his experience of CV.
I doubt the people who will allegedly lock themselves up indefinitely - even if fully vaccinated - were the type of people who frequently went out even pre-pandemic.
In any case, they are the minority. Wimbledon and Wembley are as full as they're allowed to be. Same with shops, pubs, restaurants and so on. There's a huge desire to get back to normal, and that doesn't mean masks and 'distancing'. It means normal.