No judge is going to sign off on an injunction when an epidemic is raging nationwide, with a large number of confirmed cases on the west coast [1]. I'll eat crow if you find one with that much chutzpa.
They may in extreme circumstances - the courts still will function and I'm sure we're going to hear a lot of BS challenges to this restriction - but if authorities step over the line and, for instance, close down a small political rally of 300 while an opponent's rally of 500 is unaffected, then injunctions will happen.
