I remember when CETA was ratified, and there was talk about labor mobility which got me excited. Having more options on which countries to work is always better than fewer, but I ended up in the U.S. and turns out that worked out much better for me. Others may have different views.
I was once young and had romantic notions of living in Europe, but I realized that I cultivated those notions as a student, tourist and urbanist. The realities of living in Europe are more complicated. I can still deal with the downsides (would still love to live in London), but as I've moved around and lived in more places, I realized it's not incontrovertibly true that the European lifestyle is better than in North America. Just depends what you're optimizing for.
Europe is still a good destination for the well-heeled (and with a job lined up -- but that's true for almost any developed country), but if one isn't in that situation, Europe not the paradise many young people in Canada think it is. Sure you have walkable cities, universal healthcare, social safety net, train travel to tons of interesting destinations. But you also have to deal with a lot more bureaucracy, inefficiencies, and ultimately being a foreigner in a land that is not an immigrant nation like Canada is. The cuisines in European cities are nowhere near as diverse as the cuisines available in Toronto. You can't take risks and do new things as easily. The downside of the good life is comfort -- and a lack of dynamism.
p.s. looking back on CETA after 7 years (it's still not fully in effect), it looks like the effects were largely negligible to Canadians except in niche areas because of other effects that canceled out the advantages.