I think the answer depends on what you're basing estimates on.
If you're comparing AoC's sales to that of WoW's sales we're looking at 4-5 million easy, especially considering how fast this game has sold and the strong continued sales already displayed now with the game going on it's 2nd month. The popularity will only rise with patches, improved gameplay elements, and expansions, and as word of mouth gets out there. The only thing holding this game back is the M rating that restricts a massive demographic from getting the game.
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I think the answer depends on what you're basing estimates on.
If you're comparing AoC's sales to that of WoW's sales we're looking at 4-5 million easy, especially considering how fast this game has sold and the strong continued sales already displayed now with the game going on it's 2nd month. The popularity will only rise with patches, improved gameplay elements, and expansions, and as word of mouth gets out there. The only thing holding this game back is the M rating that restricts a massive demographic from getting the game.