This is like saying "Different servers have no place in a MMORPG!"
You're high as fuck. Separate servers and separate layering are simply a requirement of populated MMORPGs and always have been, and always will be. Layering is no different from a different server, except you can still play with people from different layers if you just party up.
If anything, layering is one step closer to a truly persistent online world. Its certainly a lot closer than different servers.