>By the listed measures, this is still the case.
What measures? The ones in your original comment?
>healthcare, education, sanitation, nutrition, shelter, comfort, convenience, etc.
In the US, you can trace all of these back to wages, especially since healthcare is tied to your employer in the US, and you can look up any a variety of data to show that wages stagnated decades ago, length of tenure at employers decreased, increased participation in "gig" economy and service industry which don't offer benefits (i.e. loss in wages), consolidation of growing economies in fewer areas of US resulting in cost of land rising disproportionally to income, etc.
> Do we have any reason to believe our children will not have better healthcare, nutrition, access to information, etc than we do?
I don't know who "we" is here, but it's reality for people who spent 20 to 30 years at a manufacturing facility that was then outsourced and who now live in a town with no significant business, whose kids' only hope is to use college to boost themselves into an in demand career, but that involves moving to a HCOL area where they now have to sink a significant amount of money into their land purchase (house) to establish themselves, away from the rest of their family.
>If we don't, then what justification is there for agitation?
I don't know what other sources of information you want, but I know pretty much everyone in my parents' generation got married, had kids, raised families, and now the number of people that are coupled up is around half in my family and friends, and those with kids by mid 30s is even lower, maybe a third.
There's shortages of healthcare providers in rural areas because no one wants to live there, there's more and more competition for in demand areas as everyone tries to get in before they can't afford it.
This is all volatility. This didn't happen when everywhere was growing, but this happens when you have a divergence, and you're either on the upswing or the downswing.