Is Bitcoin the final form for humanity?
I don't think so, bitcoin is just an step for economic freedom, but is is just a small step in the humanity's evolution.
Decentralization has long been dreamed by all different social models, is there another step to be taken?
I think there is important to find a way to avoid the scenario where someone has control of the 51% of the network, with that it would be perfect.
Can humanity (humans) learn to hang on and manage their finances?
Yes they can, but is a fight against all the marketing bombs we get all time in the streets, tv and the internet.
Or is Bitcoin an experiment to show that we're not capable of managing our own belongings and do require central authority?
No, I don't think bitcoin is an experiment to prove that, it's a tool to manage our own financials, without a third party like a bank or a gov.