What makes you think that if they do go non restricted they won't also change the length requirement? A little common sense says that a 10.5 inch barrel is just as dangerous as a 22 inch barrel (it's actually less dangerous with the lower muzzle velocity).
I think that they should just go with the idea that if you are licensed to own a firearm you are licensed to own any firearm available in Canada and if you are responsible enough to use a long rifle away from the range you are responsible enough to use any firearm away from the range.
Some stiffer punishment for those that do use them in the commission of a crime and leave the law abiding alone to enjoy their sport.
That being said I now have 5 AR's, the fifth one is in the mail on it's way to me and is my first AR-10