No, I'm comparing marriage inequality to those things. And I'll go further and add heterosexism to that list.<quoted text>
So you're comparing the institution of marriage, the union of husband and wife, to those things?
The institution of open and legal slavery has all but disappeared from the planet. Compare that to how prevalent slavery has been throughout time and in different cultures. The earliest indication of slavery was in 1760 BC.
"David P. Forsythe wrote:'The fact remained that at the beginning of the nineteenth century an estimated three-quarters of all people alive were trapped in bondage against their will either in some form of slavery or serfdom'".
However, in 1981 the country Mauritania abolished legal slavery--the last country on the planet to do so.
An institution that existed legally for nearly 4,000 years; maybe longer, came to an end.
Societies simply stopped tolerating it.
Societies around the globe have stopped tolerating marriage inequality as well. They're stopping heterosexist ideology as well.
Openly LGBT individuals are seeking and getting equal rights. The days of discrimination and prejudice are fading away.
In a few generations folks will look back at these times and say, "Why did our ancestors make such a big deal about being gay? It's just another characteristic like being blond or being tall or being Caucasian or being left-handed, etc."