Im sorry, are you a psychic? Xbox one can have many things going for them in the second half. As it stands Xbox One is proving itself more and more. They will do what it takes. They already bought Gears of war and Minecraft. Maybe they will buy more games or push holo lens more. Hell, they can have blu ray less xbox one and sell it for $100 dollars. Consoles sales always go up towards the middle and end because it is when they are the cheapest and have the biggest games coming out.
If they don't goal themselves on how many units Sony sells (which is wise) I'm quite sure they won't "do what it takes" to match 360 sales either if it would mean taking a loss or minimal profits.