The idea of invoking “emergency powers” was a last grasp for the leverage Trump had already abdicated, and it had to be abandoned for fear of what the courts and public opinion would say.
After the January 8 Oval Office address, little doubt remains of how this shutdown will end. Sooner or later—probably sooner—it will end the way Trump’s threats of nuclear war upon North Korea ended: with a sudden Trump about-face. It is now only a matter of time. The polls will arrive over the next hours. Democrats and Republicans will both see that Trump did not move public opinion in his favor. They might see that Trump could not even motivate very many Americans to watch him. The panic slowly building among congressional Republicans will boil. Trump, trapped without a decent exit in a predicament of his own making, will yield everything and get nothing.
Trump will cope by locking himself into the Fox News closed-feedback system of flattering disinformation, emerging only to emit enraged tweets pretending he won big and denouncing the media for reporting otherwise. He might even convince himself to believe it. His political allies will repeat it without believing it.
But he will have lost. Lost humiliatingly. And he will have done it almost entirely to himself, before the amazed eyes of the opponents who, dumbfounded, watched him do it to himself, without a plan or even much of a reason, other than the empty and fleeting joy of feeling briefly powerful by inflicting pain.