Col_Pladoh said:
One plays a role to an audience. In game form that mans at least a Game Master that responds in kind according to the words spoken. More generally the audience for such play includes one or more additional player participants.
...
Those are facts, not opinions.
Well, my online "MM"ORPG experience goes back to the original Neverwinter Nights on AOL (unfortunately in its latter days), and my PnP RPG experience goes back a little farther.
In NWN, I joined a guild (the Servants of Mystery), and together, both in the game and outside of it, we roleplayed members of the Neverwinter temple to Mystra, Goddess of Magic. In truth, I got more into-character in the online venue than I ever did in my face-to-face roleplaying at the time, where, surprisingly enough, our encounters were largely similar: a break-in-the-door-and-fight-the-badguys style of playing which, I'm certain, just about everyone has indulged in from time to time.
While, in most cases, the monsters and other set encounters didn't treat us any differently than the gentlemen and ladies playing Cyricists or Banites or Purple Dragon Knights, the other players certainly did, and occasionally a staff gamemaster would take a more active role in the way things played out (taking on and roleplaying Lord Nasher, hosting events, joining a combat, etc.).
By the facts you laid out, it would seem that you would classify NWN as a roleplaying game during the time in which a gamemaster was actually present, and as a non-RPG when he or she [or they] wasn't [weren't]. So, NWN on AOL was, simultaneously, both an RPG and not an RPG?
The same situation (with, admittedly, prettier graphics and a more real-time resolution system) occurs in just about every modern MMORPG (where GM-lead events are often a major draw). Many people (especially those I play with) roleplay quite happily to the other players as the audience; what do you see as special about the need for a D/GM as part of the audience?