Mobius has an easy simple rule to follow, no pvp, except in a CZ. There's no grey area, it's nice and clean. how would you decide if someone is roleplaying or not? No attacking and commanders, except piracy, bounty hunting, CG, or powerplay factions. There would be no way of knowing both sides of the story to figure out what happened and if it was legit.
Imagine this, you're driving along trading, you get pulled over, scanned and then killed. You even have video evidence of it. In mobius he'd be banned no matter what. In the new mode, someone would have to figure out If the guy was a pirate, maybe he was just trying to shoot out your drives but hit your powerplant with a railgun before he sent out the message, maybe you had a bounty, you forgot about, 100ly away, that he was collecting, maybe he was an opposing faction member and you didn't know or see it. It would be too much grey area and rules to wade through. Would pirates be allowed to kill bounty hunters attacking them? would bounty hunters be allowed to kill players who take their kills? So many rules and exceptions it would be impossible to play in. You'd need to consult a rulebook before you do anything.
Also does anyone know how(or if) mobius deals with station rammers? That seems like a gaint can of worms that noone wants to open. It seems pretty straight foward if someone is grinding another person to the wall. what about if someone just boosts through the slot and kills another person on their way out? no way of telling intent from that.
You are right tho, if it was possible to do well(which i dont think it will be) I think it would be a popular group. It would probably be more popular than mobius.