I don't believe the YWG pilot base has been or will be closed.
I thought home bases were tied to the fleet. If you're a new hire then you're on the ERJ which means YYZ only at the moment. In a while you might be able to bid for A320 F/O.
If it's any consolation I think there's a few YWG guys sharing a place in YYZ for duty cycles. You should ask around once on board.