More likely it just slowly declines like Japan. Or if anti-migrant sentiment continues growing at the current rate, it breaks into a race war when the AfD and PFN win the majority of votes in Germany and France respectively.

I dont think these slow indicators and developments hold much water the next few decades. We have seen the first inklings what the brave new multipolar world is going to look like and it does not bode well for much of the world. As long as Russia breaks down before the shit really hits the fan, Europe should be fine(r) than most.