The 2070 is also $600. That's twice as much as what AMD can expect to charge for updated Polaris. Since AMD is tied to GF and needs to buy wafers, they're just as well off selling at low margin as not. NVidia is unlikely to want to chase after AMD too hard as it erodes their own higher margin parts after a certain point.
AMD isn't in a place where they can win, but they might be in one where they also don't have anything to lose either.
AMD isn't in a place where they can win, but they might be in one where they also don't have anything to lose either.