1. Religion continues to decline, and the world is bound closer all the time.
2. Who is to say that optimism won't be the dominant view?
3. If economic times are good, people make it work.
4. Was it triggered by an economic collapse? And then political scapegoat making?
5. Quebec has been part of Canada fir centuries now. How long until you would call this a success?
6. Yes, a closed society with a dictator who repressed dissent. There were other factors at play.
7. If you meet some of the immigrants who are making things happen, creating products and bringing new ideas, you could change your mind.
The world is open now, so money, people, ideas move freely between borders. Canada, has a small and traditionally risk-averse country, could advance itself very well in this new world.
What's the alternative? Saying no to foreign investment and skills? Sitting on our resources as our future?
EDIT:
Army Guy helped establish, on this thread, that what appears as an ethno-religious phenomenon is actually geo political. That means, with time, we should see the melting pot effect that (in Canada) absorbed Irish, German, Chinese, Japanese, Italian and then Indian immigrants. It's also borne out by the Pew survey that shows Muslims "lose" religion at the same rate as Christians in the US.
Fifty years in the future is a long time. Go back to 1971, and see if you could predict the roles of the Pacific countries, Europe, the fall of the Soviet Union, the new global economy, and digital technology, Green energy... and the role of women, LGBTQ, international terrorism...
If you're talking 50 years into the future, you're talking about mega trends. I would bet on continued prosperity, increasing interconnectedness of countries and their governments, increasing prosperity and the reduction of poverty, more Green technology.
And my predictions are not optimistic, they're based on what's happening right now.