OK does anyone here seriously think that "Corbyn's victory means Sanders will win" wasn't complete bullsh!t? Alas too many here bought into "Brexit and Trump mean Le Pen wins" but seriously, what about that one?
For that matter this can be easily disproved by comparing the 2006 and 2008 elections in Canada, the country most closely linked to and culturally similar to the US, to the US. Or hell even 2014/16 vs. 2015 in Canada for that matter.
I do think there is a clear rise in populism (largely from the right-but also from the left) in western countries. Trying to pinpoint exact electoral victories and dates with other countries won't be accurate as you've explained, but the post financial crisis political scene of western countries has seen a very sharp rise in populists from both the left and right. Even if they come up short, there's no denying that they're performing significantly better than they did in the pre-financial crisis world.
A more complete outlook can be viewed here. The first 17 minutes should be enough but the entire lecture better explains the macroeconomic (and to a lesser extent, the social) underpinning to this rise in populism.