30-35 million seems way too low for the XB1. That would be around half of where I expect the 3DS to end up (65 millionish) when it still has lots of big games coming, even if multiplatform. I'm thinking 40-45 million, with 50 million not out of the question.
At this selling rate, it's not low. It's the upper limit for someone. I predict 45 mil. at max.
XBone outside US/UK/Latin America is selling like shit