Well you have to understand that we are not demanding something which hasn't already been done. World 10 has been designated as a hub for German/French players. Will that deminish the world population? If so, why would SE do that when trying merge servers? Same questions you asked can be applied there.

I don't think simply saying exactly what they said in regards to the French/German favored World 10, only for RPers on, say World 9, would make that world a barren wasteland. In fact one of the many reasons Besaid has a thriving community where other servers feel 'dead' is because of the RP presence.