SASKATOON999 - Of course you are right, airlines can cancel flights for any reason but they ARE under an obligation to offer hotac even in unforseen circumstances. If passengers still want to travel to their destination then the Airline is obliged to get them there either on their own airline or refunding an alternative method of travel.
Just talk to the AUC if you dont believe me. If a flight is cancelled less than 14 days before departure... that is an on the day cancellation (not a pre planned cancellation) then passengers are entitled to hotel accomodation/meals until their new departure and 2 free telephone calls.