A scaled down version have been proposed on Blackrock forum. Tbh they just finished talking specially about SM (nerdraging). A scaled down version from my point of view is more work since you need to rework every single 284 item. What I proposed is more general I think and easier to implement and less line code working (less work the for developer team and less stress for the server also). In short a system that check Ilvl inside on those specific enviroments, if some is 284 simple auto unequip it. In the same way that exists a system that checks for AFKers, in example.
Aswell, for how I see it it will impulse activity on the 3 realms, specially on Blackrock who is dying. If Cross Realm simple happends like that puff there you go now pew pew pew (we need to wait the poll, I'm suggesting a question into the poll). Blackrock will simple die like Warsong did on Molten's era but without even cross realm. CRPvP will simple accelerate its death, is what i think. And if BR dies, you would transfer/merge the active toons with wich realm Lord, IC? NOPE.