Redefining the two media so that they no longer have any relationship to each other is just another form of a "Sky is Falling" post, it just involves putting one's head in the sand instead of running around, losing it.
MMORPGs and RPGs have a huge crossover audience. The mere fact that there can be threads on ENWorld with "WoW" in the title and almost everyone knows what it means attests to that. Likewise, in five years of MMORPG play, I've found one (1) person who didn't know what Armor Class was. They weren't all D&D players, just as not everyone here isn't an MMORPG player, but there's a massive, massive crossover between the two audiences. White Wolf wouldn't have gone into a second edition of one of their three MMORPG license lines if there wasn't -- heck, they wouldn't have licensed three MMORPG games to begin with.