Virginia still has a marriage ban in its state constitution and the voters have yet to have the opportunity to remove and/or replace that language. Democrats started the process in 2021, but it has to be restarted because Republicans blocked the measure when they won the House of Delegates later that year.
So far, Nevada remains the only state to have repealed its constitutional ban (in 2020). California will almost certainly be the second state to do so, as the Legislature put it on the November ballot.
There are absolutely a lot of Republicans who still intend to nullify all same-sex marriages if they get the chance. They'll never have the public support to do it and they don't expect to let that stop them. Either way, this is definitely an impressive move from Youngkin.
Those Republicans don't need the public. They need five votes on the Supreme Court. I'm not inclined to think they have the votes now, but they certainly could in the future. If Obergefell falls, the constitutional bans in nearly 30 states suddenly become fully operational once again (and that doesn't even include the small handful of states with statutory bans).
Except all it means is that licenses won't be issued locally. They are still required by federal law to recognize marriages performed in other states.
Furthermore, the most likely reversal is one which overturns Obergefell's reasoning but maintains full faith and credit anyway. I suspect Barrett at least is on board with that as well as probably Kavanaugh(I think people may misread Gorsuch with Bostock but Barrett has shown herself to be for proceduralism what Gorsuch is on Indian affairs)