I think it'd be nice to have an everything simulator. I don't think BIS should hold themselves back if they're trying to go for higher realism. If anything, it'll attract a lot of people from different communities. People who play sim-games like DCS will be interested in playing Arma because of increased flight immersion. If driving simulation is improved, then people from communities that play the likes of rFactor will be interested as well.
So yes, I would agree that realism should be pushed for. As far as gaining accessibility to this level of realism is concerned, it would require BIS to make appropriately in-depth tutorials, and a lot of practice by the player. I'm not saying I'm the greatest of pilots, but I'm certainly not the worst. My in-game piloting ability has been gained from practice. Arma shouldn't be a game you can just jump on and be instantly good at. That's not what it's supposed to be (from what I gather ).