I agree that things today are drastically different for families than when I was growing up in the 70s and 80s. But I think families can "make it" if they struggle to make ends meet. It might take some time, but I think they can get by. My wife and I struggled from check to check early in or marriage like everyone else and I wasn't sure about affording kids or other things, but we've made it work. She worked before we had our oldest, but stayed home because after paying childcare, a car payment, and gas her check just barely paid for all of it. We were basically living on my check anyway so she quit, we got rid of her car and adjusted our lifestyle to what it needed to be in order to make things affordable.
I think others can as well, many just don't know how or don't want to.
If you're not a particularly smart or talented person you shouldn't be able to have children until you can provide for them. Regardless of how much folks perceive the cost to be . . .
Some folks are fit to be parents and others aren't . . . regardless of their income.
How have the economic prospects fallen? Do you really think there are fewer jobs or are they just harder to qualify for?
IMO there are way more opportunities out there if you're willing to look for them and work.
But like you mentioned, I think the incentive is no longer there.