West Europe!
More seriously, the point is that if that's a problem for west coast players, then the obvious solution is to move the data center somewhere in the middle, not just flip which coast gets screwed. Then at least east coast and west coast are roughly equal, and the people who live in the middle get an overall ping time reduction. Other games figured out years ago that it's probably in their best interests to try and provide as even an experience to their playerbase as possible rather than heavily slanting to one area geographically.
That's what makes the "we can't tell you anything but that it's somewhere on the north american continent" so infuriating. It just leads to EVERYONE feeling like they're going to get screwed instead of only the people who are actually getting screwed.