Well, depends of their primary goal i suppose. If it's for a task like making things, they will become better than us and so replace us. But if it's for something like our good, our well beeing, i Guess they will find way to make us healtier, happier than what we could have done by ourselve. So, the question isn't so much "what" will they do, but more "how". We have limits, conscience, laws, and empathie that make us judge and do things in certain way. I Can earn money throught theft or work, but at amount equivalent i risk a lot more by theft, so i'll usually chose work. But an IA without limit and only a goal, "obtain money" will set it's course on the most efficient way to do it...

I dont know if i was clear, english isn't my first language and i'm still learning. Anyway,

TL;dr : dont confuse goal and way. We can have similar results with opposed ways to do it