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I don't know if anyone else has noticed this, but I came across something very telling on DDOracle that would suggest the DDO playerbase has taken a huge hit over the past week or so. While it's not certain that ESO is the cause, I think there is a pretty good chance that it is. I also don't know if other MMOs have experienced a similar hit, but I find this very interesting considering the dedication of the DDO community.
Notice how the nosedive corresponds with ESO's release.