Yep, if you have a system, oligarchs will do what they do best. They will take control of it. Who thinks the banksters are going to go quietly into the night and give up their power? I don't think they will. They'd rather burn the house down than hand over the keys to a new owner.
Also, Bitcoin is not anonymous. People keep suggesting it is, but transactions can be traced. That was the point of ZenCash and some other alternatives. The goal was to make the entire system anonymous. It can be done, but I don't think BTC will do it. A small part of me still thinks this is all a setup too.