subject line is a half-hearted joke, but the only reason we have 30-year mortgages is that Fannie and Freddie will buy 30 year-mortgages. For them to go out farther, the FHA would have to approve them to buy longer-term mortgages.
No way banks will just do that. Way too much interest rate risk to originate a 40-year fixed rate loan without Fannie/Freddie support.