[Cthulhu_]

I think they (or some of them) are jumping on top of it because now they've got an abstracted (and regulated) market product, something that should come with a lot less risk and with interactions with the existing stock market systems. They don't care about bitcoin, they care about the futures market, speculating with virtual products (= futures) on virtual products (which used to be physical ones like oil and tulips and whatnot).