IINM it's very costly, and once you pass the threshold you could do a reverse mortgage on WL
What do you mean by costly?
Individual disability insurance usually costs between 3%-6% of gross income being protected (obviously depends on age, gender, occupation and policy options).
If presented with two otherwise identical jobs, one paying $100,000 while healthy and working and $0 if sick or injured, and the other paying $95,500 while healthy and working, and $60,000 tax-free if sick or injured. Which would you pick?
I'm not really sure what you mean when you say "once you pass the threshold you could do a reverse mortgage on WL".