The Norse stuff seems to have been debunked already, but as I said before, I think the fatigue with Norse stuff is less specific to video games and more a Western pop culture thing. Norsemen and vikings (and even just the themes and visual iconography related to them) get an absolute shit-ton of play in western pop culture, and some of the biggest video games of the past decade and a half use a Nordic aesthetic. Skyrim and God of 4War being the big examples.
As a result, I think a lot of people are just chafing at the idea of playing as another bearded white man in furs wielding an axe. We've seen it a lot and it's just kind of unexciting these days.