For sure, with any change comes risk, but at a rapidly growing company there's even bigger risk with lack of change. (http://randsinrepose.com/archives/the-old-guard/ has some good perspective on this, I think.)
In any case, of things that keep me up at night, falling into a boring role is definitely not one of them :).
In any case, of things that keep me up at night, falling into a boring role is definitely not one of them :).