If you don't want a marriage, don't have one.
If you, and people who feel as you do, don't get married, the system will collapse of its own weight.
Meanwhile the people who value marriage (and apparently there are more of them than there are of you) are free to choose, just as you are free to choose. Those people are responsible for the consequences of their choice, just as you are responsible for the consequences of yours.
This seems to be a good "problem" in which you would best lead by example. Seems like fewer and fewer people see marriage as the default now, so perhaps you can help it reach critical mass.