I think marriage will come around. It’s too stabilizing for individuals for it to be destroyed. We’ve simply forgotten all the bad reasons that caused marriage to become normal. Mostly it is women who’ve been convinced that committed marriage is a bad thing.
Long term, I agree.
For the next half dozen generations, I don’t know. You have to remember marriage as a universal institution is relatively new. In the last two hundred years, it went from the lower class has no exception (or ability) to get married to the high marriage rates of the early 1900’s.
Simply put, the lower classes have have typically had lower rates of wedlock throughout history.