It was exactly this sort of challenge that derailed Obama's even more notorious and much larger DAPA [Deferred Action For Parents Of Americans] Administrative Amnesty. Its blocking by a Texas judge remained in place after the U.S. Supreme Court deadlocked on the issue. On June 15, the Trump Administration rescinded DAPA.
Because it did not simultaneously rescind DACA, which Trump had famously promised to end "on Day One" but subsequently appeared to go squishy on, there was initially much gloating from the Treason Lobby, which assumed this meant DACA was safe. But unusually, and perhaps significantly, the Trump Administration took steps to correct this assumption [Fate of DACA remains uncertain after similar program officially ends, by Reeves Miller Zhang & Diza, AsianJournal.com, June 29, 2017].
Now it seems that the other litigation shoe is dropping. Legally, given the fate of DAPA, it seems certain to prevail. It is even possible that U.S. Attorney General Jeff Sessions will decline to defend DACA at all—ironically, a technique pioneered by the Obama Regime with its sabotage of the Defense of Marriage Act.
For reasons that aren't clear to me, there is certainly a lot of breast-beating about the recipients of DACA–the so-called DREAMers. Is it possible that Trump, in his messy intuitive way, has just been waiting until the courts took the problem off his hands?