I see no reason why not. I'm making a sustainable salary, it comfortably supports my lifestyle (which is not exactly frugal) and I can put a bit away for the future. Of course lifestyles change, but if I've got money in the bank and a transferable skillset then I'd say that puts me in pretty good shape for the unknown future.

I think people living the way the article described are far less likely to be doing it in 10 years' time. IME very few people treat their job as their passion after starting a family.

yes, let's move the goal post.