This is his final term, and he doesn't have to be re-elected. Short of pulling a Nixon, he won't get impeached or be forced to resign.
Sort of ironic though that he began well with foreign relations, and steadily got worse from there.
The Middle East leaders dislike America more (if that is possible). Assad is still here, Iran and Iraq have to contend with ISIS, Israel thinks America is giving Iran carrots while ignoring Israel's concerns, and another flop of a peace-plan with the Palestinians left a bitter taste on the dying Saudi king's lips.
China sees America as a threat and snubs Obama often, and every time America claims it doesn't want to contain China, it makes the Chinese believe the opposite. Honesty about America wanting to contain China, would go a long way to helping talks over the South China Sea and North Korea.
As for Russia, inaction in Ukraine at the beginning and failure to send military support made America look weak, bungling - and irresponsible. The sanctions screwed up the reset, and now Russia views America as an enemy, rather than purely another economic and military power on his doorstep.
I wouldn't want to be the one to clean up that mess, and there are several years still to go.