The reduction in player base is also due to the fact that the game simply wasn't "new" anymore so the initial excitement falls out and those who aren't into a game for the long run will drop off. Percentage wise fallout 4 had a similar drop off soon after its release and it is by far a more story driven and immersive game than no man's sky.
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But there's more than 2000 people playing at peak hours.
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Oh man! 2,000! [spoiler]If Destiny can do it, NMS can too.[/spoiler]