Would it? Plans are already underway for a national solution to the abortion question to be enacted by Congress, why not gay marriage as well?
Well, on the marriage question, at least with regard to Supreme Court decisions, the 2013 decision mandated that the federal government must recognize same sex marriages from states which allowed them at that time. That reasoning was that the states had the ultimate authority over marriage and family law. The 2015 Supreme Court decision mandated same sex marriage nationwide.
Presumeably it depends on the legal criteria the courts would use to make decisions. With abortion, overturning Roe vs. Wade gives the matter back to the states. Since in 2013 the Supreme Court ruling on marriage was that the states make marriage and family law, that’s why I thought overturning Obergfell would send marriage back to the states.