This is a fun idea, but ultimately circumstantial. I don't think things are being orchestrated to the degree that you ascribe them to be. Banks are certainly interested in the space and they are certainly entering it. They may be keeping Bitcoin's price down a bit to attain more favorable pricing, but at a market cap of over $200 B, wouldn't that be pretty difficult to do for very long? It is also hard for me to believe that there are people at various banks pumping dozens of alt coins. I just can't see it.