What is really to hate about YWG's current terminal? It's a bit dated, but it's also all in one building (no train between terminals needed). Walking from one gate to another takes on order of 2 minutes. It has the only Swiss Chalet in Winnipeg. Wait till people start .....ing about the airport fees inevitably going up due to the over budget new terminal, perhaps than they'll appreciate the old one.
I don't personally believe a new terminal will generate anymore traffic (and perhaps even less if fees go up and it becomes cheaper to fly out of Fargo).