"A few years of low interest is great, but if those years are followed by high interest rates !! "
That may be true AuCu and if they can't afford higher rates they have two choices: 1) Don't buy; or 2) Fix their loan for say 7 to 10 years.
While option 2 will mean they will probably pay a bit higher interest rate now it will give them peace of mind and allow them to get in a position with their loan where they can afford to pay higher interest rates.
