It depends on what you mean by guaranteed basic income. There are many schools of thought.
Is a guaranteed basic income an alternative to all of the support and income replacement measures?
By those measures, I mean every form of income replacement, from occupational illness coverage and wage loss insurance to car insurance. Is the idea to replace all of those things?
If so, it would have to be laid out, but good luck with the constitutional negotiations with the provinces.
If the purpose is to ensure a living wage for everyone, it's a welcome initiative. Provided the EI system undergoes a broad and in-depth review, I think it would be a good starting point. It could be a good place to start, in terms of making sure those who lose their jobs, at the very least, have a basic level of income.