He's going to be 90 before his 71st birthday, that's how he's going to deal with it all.
The one big headache though, Obama will fix for him, by killing ISIS before he takes office. Mosul and Ruqqa will be in Iraqi and Kurdish hands by then.
If he can get things done and fix things, I EXPECT HIM TO SLICE THROUGH the Congress bullshit, and fix Obamacare. Insurance companies that can compete across state borders all over the US, is one big fix, and it hasn't been done because of lobbying, most likely, otherwise there is no other reason. If he truly can cut through the swamp there, I'll be the first to applaud. 
I cannot stand the sausage making in Congress. It is killing this country. That's the number one thing I expect him to fight for based on his history, but then he wasn't a politician. He had the money and called the shots. Let's see if he can call any shots he really wants now.
It's the only chance I give him. If he succeeds to REALLY DRAIN THAT  VERY SWAMP, I WILL APPLAUD. I don't have much faith, though. That swamp is as old as dirt.