As for this time next year, that's an asinine challenge. Getting something up to the level of the USSC, much less getting a decision out of them, takes longer than that when there isn't a legitimate need for a speedy decision.
Second off, DoD regulations have less weight than law. They are issued by the DoD rather than passed and signed into law. The President can tell the DoD to shove it on a DoD regulation any time he wants.
As such, even if a final court decision somehow failed to address an outright ban, the President could take advantage of DADT being struck down toss out the DoD regulations on the subject.