At the risk of another downvote-avalanche in this uncritical echo chamber of anti-brexitism, I'll say that I still think it was a self-fulfilling prophecy. I was against the whole thing in the beginning, but there's no reason that it couldn't have worked out well for the UK, and where they're at now was in no way inevitable.
No, I don't think there's some deep state conspiracy to make it fail. That wouldn't make sense, since nobody gains. I do think that the self-defeating pessimism of the British has a big part to play though.