That would be insane. This guy obviously doesn't understand the concept of compounding and how it's exponential, not linear. You're much better off getting a 15 year mortgage and paying it off. Then you have almost the entire proceeds from the sale of your house to use as a downpayment for a new house. I just bought a new house and I'm paying a few hundred a month over what a 30 year would be, but I'll be much better off for it.
I got a 30 year mortgage, but paid extra principal during a very prosperous long term consulting gig. This resulted in me having it fully paid off just before the recession, where I was out of work for a long time. Not having to worry about mortgage payments greatly reduced my stress level
A 50 or 75 or 1,000 year "mortgage" would have payments not terribly smaller than the payments in a thirty year mortgage.
Innumeracy is common amongst those claiming to be "scientists". Mann's "hockey stick" shaped climate change curve (and therefore "global warming" theory) is a good example. One might call me harsh in describing such and eminent climate scholar innumerate, yet otherwise Mann must be a fraud -