Even if they aren't open about Bitcoin everyone is holding some. Even if they say "we are not interested in Bitcoin, we just want the blockchain" sort of thing, they are secretly holding lots of BTC, because at the end of the day the guys in the banking world aren't idiots, that's why they are rich.
I haven't thought about it that way, but completely agree with that. Bitcoin has earning potential, and its ups and down provide also a great earn potential by trading...
Those who hold lots of money (banks) will surely play with some Bitcoins to raise their own earnings.