No. Things change and peoples minds change.
I wouldn't shock me to see a shift torwards the traditional marriage in the next 15 years making gay rights and marriage a underground issue once again.
Sure this was being said/asked in the 1970s.
Based on what? Every thing points in the opposite direction. If anything the concept of government sanctioned marriage is more likely to collapse, given the shift in attitudes plus the reality that we're basically broke.
That's probably most likely to happen.
Unlikely, but I sure would like it.