Looking at the list of Canadian musicians not already mentioned:
Jann Arden - got sick of her one hit, but it was tailor made for AAA, so it's a possibility
Tal Bachman - I can't remember if KFOG played "She's So High", but its time has passed.
Justin Bieber - if I were Canada, I'd send him elsewhere. And no, the US will reject him too. Hit From Hell candidate.
Michael Buble - might be a sleeper entry.
Meryn Cadell - picked up one of her CDs on a whim ~1993 - interesting stuff, but doubtful she'll be included.
Jane Child - oh god I hope so
Tommy Chong - really?
Tom Cochrane - I'm surprised nobody has mentioned him yet. The superior version of "Life Is A Highway".
Celine Dion - I respect Annalisa too much for this, but we all must admit it's a possibility.
Fefe Dobson - in the Deon Ferrus/Tasmin Archer class of African-American women who were basically given one hit then ignored by radio.
Percy Faith - no idea he was Canadian
Leslie Feist - ditto, and a definite possibility
Nelly Furtado - "Turn Off The Light" or "I'm Like A Bird" could get played, although I doubt we'll hear "Promiscuous"
Nick Gilder - doubt it
Robert Goulet - listed as a 'crooner'
Corey Hart - we gotta admit it might happen.
Jeff Healey - I respect him and all, and you'd never know he was blind, but damn his music was boring.
Dan Hill - nope
Terry Jacks - Hit From Hell
Sass Jordan - darkhorse
Chantal Kreviazuk - I have a couple of her CDs, she's great, but never quite broke through here. Married to the guy from Our Lady Peace
Avril Lavigne - you hafta admit it might happen
Gordon Lightfoot - no
Amanda Marshall - I have her one hit album, but she's basically had no US exposure since.
Loreena McKennitt - "The Mummers Dance" was a Hot AC staple, but I don't think it will get played.
Joni Mitchell - didn't know she was Canadian.
Alannah Myles - "Black Velvet" is really the only possibility, but dated.
Aldo Nova - see Alannah Myles, but for "Fantasy"
Daniel Powter - ugh, "Bad Day" was horrible.
Tegan and Sara - that would be interesting, but I doubt it will happen. I hadn't realized they were siblings.
Robbie Robertson - "Somewhere Down"... wait, the Band WAS mentioned. Nevermind
Paul Shaffer - now THAT would be awesome
Snow - that would certainly be different
Skye Sweetnam - Avril Lavigne wannabe
Shania Twain - Ha!
Rufus Wainwright - never quite got the appeal.
And there are bands too:
Alias - nyeah... no
April Wine - "Just Between You And Me" would be cool, but I doubt it will get played.
Artificial Joy Club - "Sick And Beautiful" would be awesome
I'm tired - I'll pick up with the B's in the morning.