sounds like he's saying:
"we dont expect our game to retain as many people as we currently have and also we dont expect to be getting any more subscribers, so.. we dont want to waste money on new servers"
Blizzards approach when WoW servers were queued was, gasp! MORE SERVERS. Worked perfectly for them and completely blows this guys logic out of the water. Which is why I think my logic above is the true reason they dont open more servers.