There's no reason neural networks can't achieve human creativity, and indeed, a far advanced form of creativity that we probably cannot imagine. Already, AlphaGo has beaten the best Go players in the world - a game based purely on imagination, unlike chess. And yes, we are just getting started! So, human brains are basically useless and obsolete within the next few decades unless we get some help from AI.
As for politics, AI could potentially be an objective voice in determining what's best for our species. Maybe an advanced form of UBI that'd best allocate resources optimally. I don't think this will happen though, the world is too full of human supremacists to ever agree over such a policy. That said, a country progressive enough to elect in a government heavily using AI to influence their policies would have such a massive competitive advantage that the other countries will be forced to adopt.