I don't know if I would be that harsh. Most people never pay off their mortgage because they move every 10 years or so and start over all again on the 30-year train when they get the new mortgage on the new house. We can argue all day as to whether or not a 50 year mortgage is a bad decision for a prospective buyer. If you know that this is a starter home and you hope to move up in a decade then having the 50 year mortgage will lower your payments and maybe help you qualify for the loan. Once you own the house then all the appreciation will be yours and not the banks (or landlord for that matter).
I don't think I would get a 50 year mortgage but it might be the best decision for some. In any case, it is not a panacea and will not make housing more affordable. Mortgages aren't the problem. it is inflated real estate prices and the only way to bring prices down is get more houses on the market.
I recall very clearly during the 2008 financial crisis, National Public Radio doing a story about a guy who bought a house and three years later could no longer afford to make payments on the house, even though we still have the same job for the same pay. I remember thinking myself, "Wait a minute, if you have a mortgage and you've got the same job for the same pay, how come you can no longer afford to pay your mortgage?" Then it came to me: adjustable rate mortgage or, as I like to call them, an "I admit I'm a complete moron who deserves to get abused by the bank whenever the bank decides he wants to abuse me" mortgage.
Of course, NPR, which sucks at journalism, never asked the obvious question.
I would only sign an adjustable rate mortgage if I
absolutely positively knew I was moving in two or three years, it got me a better rate than a 30 year fixed rate mortgage and I could afford to pay the mortgage if the bank increase the rate to the maximum extent allowable by the contract. (If I got a 6% ARM and the contract allowed the bank to increase the rate by only 0.5%/year and I couple afford a 6.5% in year two and a 7% in year three.).
Beyond that, anyone signing an ARM is certifiably insane.
A 50-year mortgage, to me, makes sense only if you can refinance later. I'm not sure interest rates are going appreciably lower in the long term.