Whatever goes up must come down. And it'll probably go back up again some time later. And then come back down. And back up. And so on, until we finally figure out how to genocide ourselves. Until then, what do you want to do? Freeze everything into your ideal version of the world?

When London sucks for you, move out. When it doesn't, move in. If London sucks for enough people, they will leave, prices will collapse, and the penniless Sitar players will move in again. At the moment, it's not looking like it's going in that direction, so I'd say we have a good while to go before the Doom of London.