Im not agaisnt this , i know i would Not play on that server or world.
Ultima online did it and eve from what i read is the most hardcore mmo game out there that puts ff11 to shame in that respect.

I guess its a solution to alot of the arguments going on atm .

People are saying they getting sick of harcore/casual debate (i see it as a debate) however if we keep making good suggestions like this one rather than saying we are right and they wrong when both sides are neither one or the other.

The worry dev might have is that it splits the players , but we would not know unless they tried it.