Earlier quoted context omitted.
If surviving on that arrangement doesn't work, change the arrangement. Move somewhere with a cheaper standard of living. Reduce expenses to where one spouse can stay home. Find another job closer. Unplug the TV already. Seriously. Yes, if you want it badly enough you'll do it. I moved 1000 miles, changed jobs twice, worked 2 jobs at once for years, have a family to care for, cut the commute from 2 hours to 15 minutes…
I'm not sure if you are just naive or intentionally contrary. Please, explain to me how a family that can barely afford rent and meals can move 1000 miles away and find work. It's not really that easy to find a new job in a town you've never been to. Or a couple in which one is handicapped or seriously ill can 'change the arrangement' You made your situation better. Congratulations. I mean that. But assuming everyone…
This country was founded on people having very little walking very long distances to build homesteads from nothing.
I'll agree there are some people who truly can't make the changes I indicated; we have a social safety net for them, and I do put in a weekly effort to help them. Most who whine "I can't" can, they just won't.
Obviously there are exceptions, and a short aphorism of "you'll do it if you want it bad enough" is not expected to have encyclopedic thoroughness covering those few genuine cases who really, truly, can't; it's directed at the other 99.99% whose only real barriers to success is themselves.