A third data center to split up the servers NA has might help. Adding servers would help... For a month... then all that came to play leaves once again bringing most of the servers to mid to low pop status.

So ya. A third data center, but I doubt doing more than that will be a good idea in the Long run. (Also I suppose upgrading the darn things. Blizzard's servers are boss compared to these... I don't remember the numbers but 20k people seems small compared to theirs and Legion had to tinker with amount allowed vs not allowed to keep the servers from imploding.)