10% of the population produces nearly 20% of the country's GDP. That kind of lopsided representation is dangerous breeding ground for contempt, so this kind of thing is not really surprising. Will be interesting to see where it goes.
Nobody thought there was any realistic chance of the UK leaving the EU either...
I mean.. it's not like it's Alberta that produces the oil. Oil is concentrated in smaller places than that, so why shouldn't those places then separate from Alberta?
By that framing you are saying that Toronto, Montreal, and Vancouver should also all seek secession.
Likewise, you could say that NYC and LA should singularly secede from America by that same logic.
It doesn't track. There is no legal precedent. Alberta as an entity did not exist beyond Canada.