A lot depends on what we mean by "superintelligent." But yes, there's a level of intelligence above which I'm fairly confident that I would change the world, as rapidly as practical, because I can. Why wouldn't you?
Not just because I can. Maybe for other reasons, like the fact that I still care about the punier humans and want to make it better for them. That depends on preferences that an AI might or might not have.
It's not really about what I would do; it's the fact that we don't know what an arbitrary superintelligence will or won't decide to do.
(I'm thinking of "superintelligence" as "smart enough to do more or less whatever it wants by sheer thinkism," which I've already said I agree is possible. Is this nonstandard?)
I wrote a blog post responding to Kevin Kelly that I'm fairly happy about. It summarizes some of the reasons why I figure that superintelligence is likely to be a fairly big deal. If you read it, please post your comments here.