This assumes that a single greater-than-human AI doesn't figure out how to get humans onto its side. Given that it will not be a cartoon supervillain, that task will actually be incredibly easy: find ways to give humans what they want in exchange for doing what the AI wants.
Sure, then it will become just another productive person/citizen. We work together because we benefit from it. Working against another intelligent being is significantly harder in the long term.
edit: And the collective is significantly more intelligent than the individual (for some but definitely not all reasonable definitions of intelligent and collective).
>Sure, then it will become just another productive person/citizen.
Only in the sense that Stalin or Pinochet was a productive citizen. Powerful people can mobilize others to their own ends without those ends being at all good or moral for everyone who is not so mobilized.
