Just from a practical stand point I don’t think we will see immersion servers. That may be something that happens in classic, though. The fact they turned Ironman into a dedicated play mode makes that more realistic than another retail server mode.
I know you don’t want people bringing up classic, but that team seems to be the one creating these kinds of servers.
I think this is where we come to a misunderstanding. I’m not sure how you play and with what add-ons, but void elf “paladins” (in example) have been all over the server for me. That’s how they treat their character and how they present themselves.
The only difference between this and the inevitable unlock of classes is that those players will go from brown to pink in my raid frames.