Simulated intelligence can be used to replace customer service and sales people. Then later used to replace managers and IT people. The more advanced creative intelligences would replace hardware/software developers. This is the point where machines are making themselves better, and leaving humans out of the loop. Humans would be delegated to whatever it is that humans will still do that machines won't or don't do.
But the even more advanced creative intelligences... who's to say what they will be thinking about. Maybe a completely new form of life. Not biological. Not mechanical. Not chemical. God atomics, maybe. The guiding hands of planet building for infant stars.