there nothing to impossible to manipulate by banks, bankers hate bitcoin for the insecuirty someday if the bitcoin goes on the top for all currency and bitcoin banks riased at al nation in the world, crypto currency replace the traditional.
of course, banks have predicted that in the future bitcoin will have more value than investing in the bank system.
this is what will change the future financial situation.
I also agree that if the bank will be involved then it will not happen, but if the individual group of bankers who have high finance involved this may happen in manipulate bitcoin price.