I'm in the camp that believes humanity won't be able to resist merging itself with it, and so that would just mean that SI creates much better encryption that SI couldn't break
So basically nothing changes.
Mankind will = superintelligence. Evolution.
Why would we create something and then just sit by and not make full use of it? Just sit at the sidelines and wait for it to take over everything? I don't think that's in anybody's nature. Already got "cyborgs" (prosthetics)