No, of course it is not a dead issue. What an absurd thing to suggest.
Is the abortion debate dead because of Roe v Wade? Is the gun rights issue dead because of the 2nd Amendment? (and that is 223 years old.) Is the issue of Social Security and Welfare dead because of 50+ and 60+ year legislation efforts? And every one of those has seen significant legal challenge, and every single one of those we debate today. Anything *but* dead issues. SSM is no different.
Just because I agree with the bare majority on this SSM decision (after reading it all including the 4 separate dissents,) still illustrates that there were 4 dissenting opinions telling us this was not a clear overwhelming decision in terms of our Constitution and Laws. Just because I agree (or anyone else for that matter, even as a majority) does not mean the issue is dead. And we have at least two States so far, Alabama and Arkansas, willing to put up some degree of continued resistance.
So tell us, how could this really be a dead issue?