Realistically I don't think much will change, the new runway and terminal are needed as the capacity just isn't there with the current terminal and facilities.
YYC has actually seen some reductions in international/transborder services, however transborder numbers are up this year but international is down.
Here are the passenger stats as of September 2012:
Domestic: Up 5.7%
Transborder: Up 7.8%
International: Down 2.9%
You can see month to month and some charts of all of this here:
http://www.yyc.com/Default.aspx?cid=117&lang=1