There was no way Aether and Primal would be merged. Not when Aether already housed several of the biggest servers in the entire game regardless of region. Doubly so when SE refuses to upgrade their server infrastructure even though it should have been handled a long time ago. The best we could have ever hoped for, then and now, is for them to allow cross data-center play. Which is likely as the servers seem to be housed in the same location in each region.