It's not about 200 IQ, it's about when we reach bigger gaps than that. Though yes, I suspect if the 200 IQ guy can copy himself at will, get hardware to do years of 200IQ thinking in an hour, etc. he might succeed.
The hairless monkeys were embodied and violent and they still took millions of years to dominate. The question is whether intelligence on its own provides sufficient advantage to be immediately dangerous. How can you conquer the world by doing "years of 200IQ thinking in an hour"?
I'm pretty neutral about it at the moment, but it's not inconceivable that something with an IQ of 400 and can think 30x faster than you, has no need to sleep and has 500x the working memory of you would be dangerous if it didn't like you.
In fact, your comment and others like it make me wonder if people are just in denial because as I said, it doesn't seem impossible?