I remember rarely having an issue on live and I used to quad kite with my Druid there. This was, of course when Luclin was live and we had Velious and Luclin zones above what we have now.
If population doesn't increase much more, I would say Velious will help tremendously when its released.
If population continues to increase though, the speed at which new content is released will not sustain the population even if custom content is released (ie, newer expansions that have been altered) and a server split may be needed at some point.
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Mokli - Druid of Karana
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