It's scary that one entity can do all this. Makes me fear what banks might do, since they can definitely profit from shenanigans.
Well, if banks want to do this, they would need to first own 200,000 BTC... so that would pump the price too. They could create fear in the market by pumping and dumping recklessly, but that would be short lived. Long term, the fundamental remains: 21 million coins. It doesn't matter how much you shake the box to create chaos, ultimately the order remains, they can't change the rules. This is why Bitcoin is the best long term investment, because they cannot change the rules. The can change anything else, except how Bitcoin works.