Well, in my sense (and please believe I have some experience as a rolemaster), what people like in RPGs is doing things, an not idle IC chat. Problem is, idle IC chat is the only type of RP available so far (unless you have high description skills and a great proficiency in English (which is, for instance, not my case)). 'Doing stuff' is highly repulsive to RPers as of now because the rules/mechanics corpus is so far from a model representing a reality. Fights are not deadly at all, if your skill is low you don't even have the slightest chance to do what a high-ranker can do (actually you can't even try), there is no coded 'cognition' stat, and much, much more.
I din't think there is sense in trying to emulate a tabletop RPG, which itself is designed to emulate a reality (note that I said A reality, not THE reality). The very thing that makes a tabletop what it is is the absence of direct interface, so I don't think we can achieve this. I think the mechanics should stick to a realist model rather than trying to get close to a RPG-concept. Beside, I don't think a realist model would impair the grinders' fun, and I'm convinced it might even help them feel an inclination to RP, as it will make much easier to identify their character's actions as their. Now, I'm only an occasional grinder (it's rare there is more than 30 on when I log in), and I'd love to hear a 'professional grinder''s opinion on that.