Bring on the blue jeans and backpacks!
On my YVR-YYZ this morning the smartly dressed fellow in the seat next to me insisted on loudly chewing his gum, smacking his chops with a volume that rivalled wind and engine noise. The equally smartly dressed gentleman accross the aisle promptly took his shoes and socks off and stuck his legs (and bare feet) out into the aisle. Too bad a cart didn't run over him.
On the other hand the various and sundry blue jeans and T-shirt crowd, some with authentic backbacks, spent a quiet and dignified flight reading, watching TV, quietly conversing with neighbours, or sleeping.
Throw out the suits, and bring on the blue jeans.