My favorite Obama accomplishments is the "surge" in Afghanistan (look how well it is doing aka NOT), raising health premiums for families as a part of his health reforms, encouraging young people not to buy insurance, increasing inequality, and NOT PROSECUTING ONE SINGLE MOTHER****ER AFTER THE 2008 FINANCIAL CRISIS.
Outside of the 2007 bit, which is pathetically true, the rest are half truths. I.E. the cost of premiums is worth helping to ensure that everybody gets health insurance; allowing children to stay on their parents healthcare till their 26 is a good thing.
Increasing inequality is a highly debatable and subjective point.
Seems rather premature to discount the Republican party as a whole. They have the house, and have a good chance at taking control of the senate.
There are several reasons to have little faith in the Republican parties future chances at taking the White House.
1) The problem is, the economy IS getting better. Barack Obama has an approval rating over 50%, he is slated to get 300+ electoral votes....and his 2nd term is a near lock to be far better statistically than his 1st term. If for no reason other than that it is the economic cycle, the economy will continue to improve in the next four years, and Obama will be the one receiving the credit.
2) They just don't have anybody. We've heard this for years now; "Oh, Bobby Jindal! He is our version of obama!", than it was Palin, now its guys like Paul Ryan and Marco Rubio. They *say* that these guys are charismatic, youthful Republicans who lead the next generation.
Then you watch these guys speak, and its

"Thats it?". Bobby Jindals kindergarten teacher-esque state of the Union Response. Paul Ryan creepy, awkward smug smiles and weird delivery. He excites hardcore conservatives, but nobody else. Rubio is not nearly as well spoken as they made it sound like; he doesnt hold a candle to Clinton or espec. Obama, and he certainly doesnt seem to be the powerhouse candidate who could take on a Hillary Clinton type of candidate. None of these guys, as personalities or as politicians, have the MASS APPEAL needed to win, an thats largely due to their biggest problem:
3) The establishment just DOES. NOT. GET. IT. They are turning off more and more voters every year; the harder they stick to the religious /cheap principles, the more people they are alienating. They continue to prove they are better at running their mouths than running campaigns, or god forbid, the country.
The consumers are leaving the business because they do not like the product. Before they are to become competitive again, they need to reexamine their business model.
As long as these problems exist, the democrats can run even the most incompetent of candidates with the worst of records for the time...and still win healthily.
See this years election.