I'd expect a lot of growth out of Hamilton in the coming years. I've read/heard that Hamilton will have roughly 1 million passengers go through the airport this year (all due to Westjet), and the airport expects roughly 5 million passengers to go through the airport in five (or ten? can't remember) years.
As airlines continue to seek ways in lowering their costs, I'd expect a lot more traffic to go through "secondary" airports (such as Abbottsford and Hamilton). Westjet already flies through both cities (very successfully I might add), offering both charter operations and regular scheduled flights. I would assume that other carriers would follow suit and start offering flights out of these cities as well. Lower landing fees, airport rent, etc. are a great way to attract new airlines. I can't speak on behalf of Hamilton, but I have a lot of friends and relatives who choose to fly out of Abbotsford simply because its convenient and less of a hassle. Why drive to YVR
in heavy traffic, pay a lot to park your car, and walk a LONG way around the terminal when you can drive in less traffic to YXX
, have free parking, and fly out of a smaller terminal?
Obviously both of these airports lack any significant airport structure/gates to handle a larger widebody aircraft, but as traffic grows airports will start expanding - such as Hamilton with its new terminal.