PUBG is a game for PC gamers that happens to be on Xbox. I don't believe it will make a very big impact on sales, much less result in a supply shortage. It will continue to remain popular, but for the most part people will be playing this on PC.
Sony's already got 4K Gaming covered. Even though most games don't run in 4K, many run above 1080p. Couple that with a larger game selection, and this point will fall through as well.
While there was a bit of "Our console runs better", the core of the PlayStation argument has always been the games. An argument that has become so one-sided that we saw the extinction of List Wars.
In short, there will be a surge in purchases when the XB1X comes out, though it will mostly be people who already own an XB1 or XB1S upgrading. I can see the Xbox pulling ahead for one, maybe two weeks as a result. But supply of the other models will be at a heavy surplus due to people getting rid of their current Xboxes for the new one.
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