I don't think the Feds could unilaterally shut down the porn industry and I don't know if the Supreme Court would issue a ruling that allows some sexual practices but not others.
A more realistic situation would be the Court strikes down the first, overbroad law, then Congress comes up with a very stringent set of liability standards and practices that, while constitutional, make certain types of porn very expensive to produce (involving non-artificial penetration) and others cheaper (artificial penetration).
(As a result, lesbian-only films are still fairly easy and cheap to make, but others not so much)
A more realistic situation would be the Court strikes down the first, overbroad law, then Congress comes up with a very stringent set of liability standards and practices that, while constitutional, make certain types of porn very expensive to produce (involving non-artificial penetration) and others cheaper (artificial penetration).
(As a result, lesbian-only films are still fairly easy and cheap to make, but others not so much)