Server and other does not matter, it is a different story. Banks do not need bitcoins between them.
And even if they did adopt the idea, they would just fork a chain they control. As they would do to use it as an embedded hiddel layer in a commercial app. Just like Ripple did, after all. Nothing good for Bitcoin comes from the equivalent of "server" and "embedded" uses.
I was talking about mass direct user adoption, which apparently didn't happen for Linux. I am using numbers from http://www.w3schools.com/browsers/browsers_os.asp. Being a site for programming enthousiasts, I figure it must be at least double than the real usage. And most importantly, the number is not increasing since 2010. And Android does not count: as someone noticed, what I was really refering to is GNU/Linux, which Android isn't -it falls under the "embedded" category for my purposes; a layer which enables something else. And that in case of cryptos, it would be probably a blockchain premined by Google.

Discolsure: I do not hate Rpple or Ubuntu; in fact, Ubuntu is almost the only operating system I have used in the last years.