I did a Blackbeard's liveaboard last year, and my wife & I both used DIR-standard rigs on the trip. Nobody aboard had much clue about either DIR or the way our equipment was set up. One fellow asked if I was a "cave diver", and I told him no, but that the water we dived in regulary was so murky that it might as well be considered a lightless environment (thus the can light and Scouts). The DM on the trip groused once or twice about my long hose, which was a bit awkward to correctly rig in the very confined area available for suit-up just prior to diving -- but that was his complaint, rather than the fear that it might somehow "choke me" or other nonsense I understand DIR-rigs have elicited from the uninformed.
Considering that my personal experience, combined with lots of trip reports here on SB, and reading about liveaboards in several dive publications all provide the same picture of an industry that isn't overly concerned with team cohesion, situational awareness, dive planning, or gas management, frankly, I think they could all use a big dose of DIR-ness, but that is pretty unlikely.
Ryan