Even if it happened, and even with Ted Cruz on the Supreme Court, I don't see it holding up in the courts. If it somehow does hold up in the courts, I could see it being a major rallying point for Dems in 2018 and 2020.
But I don't see something that extreme happening, though. More likely that Trump and Congressional Republicans push through restrictions on immigration from Muslims countries, but mostly leave Muslims already here alone. Still, the fact that Trump just won the election shows how crazy things are, hope for the best but expect the worst and all that.