I would most certainly like Obama back if it meant he'd replace Trump, and I was happy to vote for him and happy with what he was able to accomplish, but I don't know that I want him back just to have him as president again. Not with the rest of the government even more firmly in Republican hands. He wasn't able to get much done during his two terms and it would be even worse now. More government shutdowns and more bullshit from people who have no interest in cooperating with anyone who has a "D" next to their name. He'd have to EO anything he wanted, like Trump, only Republicans would be challenging the shit out of every EO.
But then again that might be the case if any Dem stepped into the role of president right now. Obama obviously caught a ton of shit just because he was black, but it isn't like a Republican-controlled government would be working with Hillary or anyone else right now either. So I don't know. Trump is a huge problem, THE problem, but it would be nice if all of the Republicans currently in Congress would fuck off with him, because they are all worthless as well.