WoW has 7 million subs right now. It has had at least 7 million subs for 10 years. EQ peaked at less than 500,000 subs. It would take EQ, at its peak, 14 years to equal one year of WoW. It would take EQ 140 years to equal 10 years of WoW. And actually the numbers are even worse for EQ because 7 million subs is WoW's current floor, while 500,000 subs was EQ's peak.

Keep subs is important but lets not pretend that EQ was a more successful game than WoW because of attrition rates.