This has precedent. When Prohibition was passed as a constitutional amendment, those with stores of alcohol were “grandfathered” into a right to keep them. Similarly, churches and other religions using alcohol (wine) in their rituals could keep purchasing/making those beverages.
Were these brought up on charges of “equal protection?” That clause has been abused more than a ghetto “wife.”
Prohibition was a matter of a constitutional amendment and as a constitutional amendment can stand by itself.
The Court’s decision on same sex marriage should have been based on standing amendments.
The remedy would be marriage amendment.
I don’t see that happening.
I don’t see any constitutional amendments passing in our lifetimes.