There are approx ~3 billion "gamers" worldwide, why shouldn't Xbox set a goal of 1/3 of them using their platform?
I’m guessing 90% of them are mobile gamers exclusively, so no, that is not realistic
Yet the biggest selling console of all time, the PS2, sold 160 million units.
You even felt the need to use quotes yourself.
"Let's go from 1 in 15 gamers to 1 in 3 gamers" sounds nice, probably gonna need employees for that!
Because approximately most of them exclusively play mobile games