Pichai had just finished talking about how how it is "in Google's DNA... to be universally accessible", and how the company cares "about reaching users all over the world, including the five billion users who don’t have smartphones today." The idea of course is that Google wants its services in the hands of everyone. And then, good old Walt Mossberg asked about Windows Phone and BlackBerry, to which Pichai responded:
It's a response that we expected, and one that makes sense. Even a company of Google's size has limited resources and needs to pick and choose where to put development efforts. There's no clear idea of how many users a platform would need to get Google's attention though.