>If the people want to change them, they absolutely have the right to do so

Not so fast. They are in a union with other provinces ergo they have a say.

If nonetheless in some asinine way they secede, will they take their portion of Canada's debt, and other liabilities?

Won't all other provinces require them to negotiate a border, security, and trade policy? Surely they can't expect to be separate yet equal to BC or even the NWT?