The girls will just move elsewhere and the punters will follow them. The majority of major cities still have street workers and unless human nature changes they will continue to do so.
Managed areas work in other countries primarily because there is an understanding that street prostitution will never go away so let's offer the girls some protection. The UK doesn't have this attitude, just look at the way that this forum is judged on Mums Net et al. and when a girl makes a fortune on OnlyFans the horror that is shown is unbelievable.
Many people think of working girls as an underclass and punters as scum, the UK is more puritanical than we might believe.
Only a small amount of people stand up for the rights of sex workers, hardly any politicians do, and those that do stand up for them are chastised. I can't see this changing anytime soon.
Personally I love the windowed areas found in Holland & Belgium etc. being introduced and a recognition that sex work has a part in our society.