To be clear, I'm not saying interest only mortgages are stupid, just the people to make no provision to repay the capital or assume they don't have to repay it.
If you plan correctly and it's a sound plan for you, then that's great.
Having to sell your home to repay the capital and downsize, possibly massively, strikes me as a daft position, particularly as nobody knows what they will realise until that sale is made. What if it doesn't sell for a year, what's the lender going to do? Grab the home off you, sell it at auction for way less than market value and give you the pennies left over?
EDIT: GaryM - you clearly have a way of repaying, so it works for you
I'm talking about people like the one in this article