Even if banks buy bitcoin and lets say got 3million of them. And start a huge dump into the market at 100k level. This means they dump 300billion in this market. If 300million people are ready for this everybody needs just 1k to buy this dip. If only 30million are ready then they need 10k to buy this dip.
After banks dumped it they got no btc and can only buy again.

Please tell me if something is wrong with my calculation.