One lost election, or one president too friendly to big government (largely out of a hopelessly misplaced longing to be liked), don't change history.
Nothing will make the left's economic policies actually work in the long run, and whenever they are in office, they are judged on their results, not their jive talk. They always fail that test, and they are failing it again as we speak.
Have a little more faith in the American people. They've done a heck of a lot in 235 years...
I have no faith that a majority of American voters will vote away their entitlements. Ain't gonna happen. Not ever, short of a major crisis.