It still doesn't protect you. What if someone was coming off a 10 year fix now, they'd still be screwed and they made the 'right' choice 10 years ago.
And up till now those products have been poorly priced and less available. As most people go for 2 or 5 years, there are far less deals on 10 and I've certainly not seen15 year deals when I was looking. The big banks didn't offer them and the mortgage brokers never advised them.
I took 5 so I'm ok for 4 more years. I looked at 10 year deals, they were poorly priced, not very available (no big banks offering) and the mortgage advisor didn't even mention them, not that I relied on the mortgage advisor. There was no indication that rates would jump from 1 to 6% in a matter of months. What would you say was the probability of that occuring now at this moment? And not in hindsight. no one was forecasting it (if they were forecasting it, banks would have been pricing it in sooner).