Are you sure that women entering the workforce wasn't _because_ of economic reasons? It seems to me that "feminism", as you put it, may have only been allowed to win, because it was desirable economically.
In other words, could feminism be a result of living/working conditions and not the cause?
Following this, people are having less kids because there is huge economic incentive not too.
I'm not sure where the disagreement is there. Yes, one of the reasons women entered the workforce was the increase in income for two-earner households.
The point is that both having two earners per household and having good birth rates are beneficial to society as a whole, but we don't yet have a system where both are compatible; we just exchanged one for the other, as the negative effects of low birth rates aren't immediate.
The economic incentive to not have kids is where the problem lies, and it's what needs to be tackled. Flexible schedules, paid paternal/maternal leave, free education/healthcare, access to affordable housing for young couples... There is no silver bullet, it's a sea of deal breakers that need to be addressed individually.
Nobody cared 50% of children died before turning 5, nor that they got shit education, nor that women were oppressed.
Our expectations and sensibilities grew much faster than everything else, not the least or biological natures.
Long term yes. But did women enter the workforce because of the economic benefit originally? Then as women continued entering wages fell (supply and demand) and the working class ended up trapped, as you say.
Another huge factor is globalization. Women maybe had to enter to earn enough when work started being outsourced.
Some people making a choice causes a cascade, taking the choice away from everyone else, kind of like car ownership in the mid 20th century.
(And bad for all the men, too.)
"Feminism" is many things to many people.
To me it is like the abolition of slavery, makes perfect sense in a modern context.
"Feminism" as it stands today in the west, just like other "-ISMS" to me, are abominations, both the cause and effect, the narcissistic, entitlement and victim culture combined with hating (average)men -- it is the dragon eating its own tail that destroys the modern society.