you should just know for yourself what you are investing in coins for, so there will be a General picture
I am not too sure if they will be capable of getting in neither. Not at these volumes they will not. They are basically waiting for the volume to be high enough that they can enter without causing a price fluctuation. Right now if couple banks with couple billions gets in and than you will have bitcoin moving up like crazy and swing one way to another like a ship on a big wave.
However they can't afford a risk like that, it is not in the nature of banks to get into risky stuff they can't control, if they can control the risk it is fine by them (look at the big mortgage crisis in 08) however bitcoin is out of their reach and can't be controlled and if they get in with billions and try to get out the more likely outcome will be a loss for them and a crippling market for all of us.