Perhaps, but Soros would need to buy the votes of a solid majority of Congresspeople and Senators in order to wield any real power through Obama. And if he could do that with Obama in power, he could also do it without Obama in power. At any rate, Soros is getting old and I think he’s on his way down in terms of wielding serious power in any arena.
My comments stand. It's a lot more complex than one man; he has a vast organization which doubtless has an even more radical succession plan, and powerful influence over much of the mainstream media and various far-left orgs. Most importantly, any weakling will be exploited by unelected forces.