They seem to have the misconception that splitting the servers like this will result in a neat little scenario where each data center contains 33% of the population.
When what they've actually done is broken up hundreds of statics (because the most populated server has been completely severed from the rest of the top-5) and pretty much hard-divided the servers into the "raiding + pvp" group (Aether) and the RP group (Crystal). So people who like to engage in both are in a very dire situation.
The bulk of players are going to migrate to those two data centers and Primal is just going to be a ghost town.