Will Barack Obama have been the last Democratic President for decades to come?

No. Trump may win again in 2020. But it would be hard for the GOP to hold the White House in 2024.

The US politcal system (and I'd argue American Culture itself) is set up to ensure what politcal scientists call "the pendulum effect."

Hopefully

No he will not. Expect Kamala Harris or Bernie Sanders facing Trump in 2020. Your guess is as good as anybody elses. It's usually hard for a party to be President for more than 8 years. Last time that happened was Reagan-GHW Bush from 81-93.

I will be inaugurated in 2017. I will continue barracks legacy

Hardly.

Doubtful.

Who do the Dims have that could beat him?

It would not be surprising. Under 0bama, all across the country the Democrats lost a THOUSAND seats. They are not in control of ANYTHING except a few inner city ghettos. They are not showing any interest in attracting voters, either. They have doubled down on their hate of the white working class. Evidently they think bigotry is a good campaign strategy, which might be why they keep losing in election after election.

Trump's ineptness guarantees that a Democrat will win in 2020

He'll be the last Marxist, radical, Muslim sympathizer for decades to come.

Sure, honey.