I would say no. I don't see the repeal of DADT as a "victory" for the LGBT community. Rather I see it as a victory for the American military machine. The military is facing problems with recruitment as I understand it. Of course the authorities have partially solved the problem of the draft with privatization (Blackwater and other such entities).
The repeal of that measure was handily approved by both the Senate and House -- all but the most rabid right-wingers voted in favor of the repeal, if I'm not mistaken. Anyway, my understanding is that the military had been weakened by the loss of experienced soldiers, through resignation or dishcharge because of DADT -- its a matter of military strength ultimately. Even Barry Goldwater said that he didn't care if a person was "straight" or not, as long as he could shoot straight.
But marriage is something else. President Obama does not support gay marriage. He has said that his "baseline" is support for strong civil union, and so on and so forth. But to be fair, his views are constantly "evolving."
What I'm trying to say is that though Obama, himself, may be relatively (I stress 'relatively') progressive on this issue, he will (even if he devotes a lot of effort to this) have a much harder time convincing Republicans and any conservative/ "Independent" Democrats left over, that this would be a good thing -- this is to say nothing of the configuration of the Congress coming in; it is highly saturated with Tea Party personnel, is it not?
I think there must be a political sea change of the magnitude of this "Tea Party" revolution, that destroys that movement and creates its progressive equivalent, in order for the gay liberation movement in this country to gain any (I don't even say 'additional') momentum.