They're already planning for that:
 •Fifteen-minute service between Union Station and Bramalea.
•All-day two-way service to Kitchener-Waterloo. This service is expected to serve all stops between Kitchener-Waterloo and Bramalea and then run directly as an express to Union Station. 
•Additional peak-period service to Georgetown and Mount Pleasant.
•New GO station stops at Breslau, St. Clair, Mount Dennis and Liberty Village.
•Enhanced Train Control (ETC) (Request for Quote issued in June 2016).