Some data says part of this shift has already happened, and travel prices weren't what drove it:

• Americans already move much less. The Census CPS mover rate was around 20% a year in the 1950s-60s. It has fallen fairly steadily since the 1980s and has been under 10% for the last few years, a record low. Interstate moves dropped too. So "rooting down" is a 40-year trend, not a future one.
• Multigenerational living is back. Pew counted about 7% of Americans in multigenerational households in 1971 and about 18% in 2021. The top reasons people give are financial (housing costs) and caregiving, not travel.
• Flying is still historically cheap. Adjusted for inflation, US domestic airfares are well below their pre-1978 deregulation levels, even after the recent spikes. The holiday pain is real, but most of it comes from timing and peak pricing, not a structural return to 1960s fares.

My read: the lever that clusters families is the cost of housing and care, not the cost of the trip. If rent and eldercare stay expensive for a generation (your "constant pressure" condition), you get more people living near or with their parents. Expensive flights mostly just mean fewer visits.

One wildcard pushes the other way: remote work. If your income no longer depends on where you live, the job-location argument in your post weakens, and "move back near mom" becomes affordable for a lot more people. That could matter more than any change in airfare.