I honestly doubt they'd unify. The language barrier is there, there's a culture barrier, and multilingual countries tend to not succeed anyways. I mean just look at Belgium. I think Wallonia still tries to claim Brussel shouldn't be part of Flanders. They might be better friends, but unification seems a little implausible.
At this point, sadly, yes. Although, TBH, the language thing isn't so much of a problem, mainly because Assiniboia[OTL's Alberta] has a large(mainly Metis) Francophone minority, and three of five of East Canada's major cities(Toronto, Thunder Bay, and Loganville[OTL's Windsor], all in Ontario, btw), are still Anglophone by a large majority. However, though, one of the biggest issue is the governing style: Both are democracies, yes, but East Canada is still a member of the Commonwealth, complete with Parliament and all, while West Canada is a constitutional republic(albeit a very progressive one!), with President, Congress and all.
The motor industry is rather different, too: East Canadian companies take much of their influence from Europe(with some American mixed in), while West Canada is mostly American(with a little Japanese), and the same goes for car culture, particularly where imports are concerned: why do you think European cars had more success than American cars in Ontario, Quebec, New Brunswick, New Ireland, Labrador, Nova Scotia and Newfoundland(East Canada's provinces), and vice versa in Keewatin, Chippewa, Manitoba, Saskatchewan, Assiniboia, Athabasca, Cascadia, and the Yukon(West Canada's provinces)?