I doubt many new markets will get OTA HD. Most people who want HD will have digital cable or satellite. Networks won't take away anything already being offered (*), but they aren't going to make major transmission investments when the early adopters have already adopted using digital signals.
* At some point analogue signals will be shut down. The CRTC has not mandated this change, but in the US the FCC has a deadline (and has already sold the spectrum, so it is a fixed deadline) so I'm sure Canada will drop analogue and switch to a purely digital transmission as analogue equipment starts to disappear. People with older TVs will need to get a digital to analogue set-top-box to continue to use those sets.
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