Now that the Monster Manual is available, how well do Barbarians hold up in the endgame?

I know when the UA and PHB were coming out, people saw the shift of class abilities changing damage types and some revealed monsters doing Force damage instead of Magical damage as an omen of Barbarians losing their niche in the late game of resisting damage and being tanky. With the release of the MM, I hear they've changed all monsters who would normally deal magic damage to deal Force damage instead, which sounds like a direct nerf to Barbarian survivability.

My question for those of you who have the book is, how bad is it? Is it most creatures over a certain CR that don't do BPS damage? Or is it only a few exceptions?

Just curious how it ended up shaking out for our high level barbarian friends, and if they've fallen off.