We will see during Alpha how the server handles it. Of course if ping shows to be crucial, and NA players having advantage over EU players and keep winning battles due to ping, and only 1 server will be in NA (I am from EU) then of course I will not play the game. But if ping shows to be an issue, then I'm sure devs will plan one more server in EU. They do not want to lose EU population due to something that would be a game breaking issue. We will see in Alpha.