Polygon is stupid and timed exclusivity will not help sales of Tomb Raider.

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Burek said:

Even though the entire Polygon article is based on bad math, poor logic and a truckload of assumptions, I do actually think Square Enix will come out of the deal ahead.
They will still sell what they were going to sell on XBox, but will avoid direct confrontation with Uncharted. By postponing the release, they will still sell a decent amount on PS, and will receive additional cash (upfront).
It's only confusing why MS would do this. They have very little to gain with this timed exclusivity, they will definitely lose money. And have indirectly increased sales of Uncharted by removing its competition from the equation.

They were always going to get Rise of the Tomb Raider, and it's the only title they have that goes for that audience. Instead of Uncharted, RotTR PS4 and RotTR XB1 all competing for the same audience, now it's Uncharted vs RotTR XB1.

You're also forgetting that the hype of the game may die down significantly during its exclusivity period, only hurting SE and Sony's sales.

Finally, it's currently the only shot XB1 has at competing with PS4 on a multiplat title. You can bet that the fact the XB1 has sold more than PS4 on exactly 0 multiplats is a monkey they want off their back so they can try and convince third parties it's worth their time sales wise to focus on the XB1 version over PS4.