[UnpossibleJim]

They already knew, by my reading. Bankers knew there was a bubble which is why it wasn't just Soros. He convinced quite a few banks and investors to help him in this scheme (and make quite a bit of cash as well) in order to pull it off. From the article:

- George Soros and all the funds and banks that participated in this large-scale attack were then able to repay the loans they had taken out in sterling, but with a devalued pound against the US dollar -

He was just the "ring leader", as it were. To date, no one had been able to coalesce all the necessary players into a single room and get them on the same page before in order to pull off such a thing. He was a proverbial shepherd corralling a bag of cats in order to make this scheme work.

Callous and greedy, sure. Intelligent and legal all the same. Blame the law makers for this one if you don't like the outcome. Their shortsightedness and allowances of quick, speculative, money-making bubbles to prop up fraudulent banking systems had a lot to do with this.