It's not as simple as that. Even if Canada doubled it's defense spending to $40 billion a year to meet the 2% of GDP figure, it would take decades of planning, acquisition and training. Of course by that time the equipment that was purchased would be obsolete and need to be replaced. Defense spending in preparation for an attack by an imaginary enemy is a treadmill that is impossible to get off. Canada's economy is too small to justify such enormous spending on a dead end, non-productive sinkhole like the military.