No both x1 and series took around 3 years to make it to 20milBoth consoles are behind but one is guaranteed to pass the other while the other is projected to keep falling behind.
As for your future estimates, nobody can tell the future
If they wanted to throw away billions to win the console war they could/would.Also, being behind the ps4 by a couple million units is something Microsoft would pay billions for
But they are into making money, not winning online arguments