Funny you should ask who moves to Idaho and actually works here? My daughter has a friend who's dad is a construction manager for commercial refrigeration with a company in CA. He commutes from Idaho to CA and NV, making huge bucks. He has built a new home here in town, owns it free and clear and plans to retire in about 4 years. He's about 50. If the marriage can survive it and you know that it's only "temporary", I guess it's do-able. He flies home every other weekend.
Actually I didn't. I was referring the the overall majority that live and work in Idaho, not those that sold a home elsewhere for $700,000 cash and moved in. Idaho has some of the lowest wages in the country. That has to be very tough for them.
If there is ever a RE bubble burst, I would predict it would be in places like Boise Idaho first, where the wages obviously can not keep up with the housing prices.