Maybe dating is so hard because we're actually evolving from being a largely monogamous species to an entirely non-monogamous one; and we're in this weird limbo without realizing that's what's happening. amirite?

I disagree. Mating rituals and partner selection is apart of evolution. Some creatures never find mate or procreate... that's basic evolution.

Or maybe dating is hard because the base determines the superstructure

It's not evolution. A polygamous/polyamorous society means instability for children, and instability is terrible for kids.

That's not evolution. That's just the collapse of a decadent society.

Greece fell, Rome fell, and the same thing happened.

I bet only so called progressive countries are experiencing this

Dating is not hard if you have time, money and a half decent personality. The less you have of any one of those the harder it gets.