However, it is important to note that the Supreme Court has not ruled that this is a fantastic policy to keep in place or that gay people do not deserve the same rights as straight people. They have only refrained from judgement in favour of upholding the ban while court proceedings are still taking place, i.e. while this case is appealed over and over again. They have thus not taken a stance on the issue of DADT itself and will refrain to do so until (and if) the case proper makes it to their courtroom.
Meanwhile, BBC reports, a leaked Pentagon survey shows that most military personnel does not have objections to end DADT. A quotation from the Guardian shows that the Pentagon has already taken steps toward a possible ending of the ban:
The Pentagon has already begun developing transition plans for accepting openly gay soldiers. Officials have advised gay service members to keep their sexual orientation secret while the court fight continues.While it is still too early to predict how, and when, this is going to play out, and whether it will be through the legislative, executive pressure, or the judiciary, it is still a step in the right direction.
The Supreme Court deciding to allow the upholding of the DADT should not necessarily be viewed as a setback, rather as a postponement of something that is already long overdue.
(Huffington Post on the matter)