Not so many in the EU really want to go to the UK it seems right now. Between the airport shitshows and Brexit, it seems that it feels like a hostile environment for many.
I get your point, but saying that no-one's coming here because of airport shitshows is a bit like the old Woody Allen joke that "no-one goes there anymore, it's too crowded".
That would be one benefit. GBP falling to $0.80 / €0.80 would drive a lot of tourism here ;-)