But seriously, that is a VERY interesting scenario, in terms of its effect on the Mormon image. If Young goes from Ohio to Canada(in other wrods, he goes no further west in the USA), Mormonism loses its association with the American West. and eventually, probably with America at all.
Assuming you had the same rough trajectory in this ATL as in our own, the Mormons in Canada practice polygamy until the late 19th Century, and then basically just morph into the clean-cut, healthy-living, protestants-but-with-an-extra-book that we all know and love today.
And it could really dovetail with the stereotype of the typical Canadian. "Oh, down in the US, the fundamentalists are all these screaming hell-and-damnation preachers, but up in Canada, we've got the nice Mormons who go door-to-door with smiles on their face, and learn foreign languages so they can minister aborad. And they have different levels of salvation, so almost nobody actually gets sent to hell! Isn't that just so adorably Canadian!"
But this is all assuming that they eventually renounce polygamy and stop living in theocratic compounds. The aforementioned Bountiful tribe in southern BC aren't really anyone's idea of nice, well-spoken Canadians.