"It is expected that the transition plan would require some Canadian TV stations to start operating on new channels as early as 2017; some stations in the United States and Canada may need to operate in the interim at reduced power levels and/or accept additional interference...The Department proposes that all regular power TV undertakings which need to relocate to a new channel assignment in the new DTV allotment plan be provided a minimum notification period of 18 months after the implementation plan is finalized."

I can't see CHCH spending money on a new transmitter if forced to move to another frequency considering it was for financial reasons that took them so long to move to RF15.