Just ignore the theory if you don't like it, is my argument. The actual articles are on the Web, in any case. I don't think anyone means any harm by it, I know, and Lord knows the theory's been told and retold by so many people that it might as well be meaningless.
Unless you're an English or lit major, Narrativism probably literally has no meaning at all to you, since "dramatic premise" is very specifically a literary thing as opposed to a "What happened in the story" kind of thing. I imagine that a lot of people think Narr is bogus or whatnot because they don't buy into the idea of a literary premise, period. And that's totally cool, I mean, if you aren't interested in literary premise, and aren't interested in how it could apply to roleplaying games... what bloody reason is there for you to even care about Narr, unless it's to get mad about it? I just don't get it.
I mean, seriously, think about whether or not you have a strong preference about whether and how books, TV, and movies deal with, in lit terms, problems of the human condition. Some people think that's absolutely vital for a creative work, and other people think it's pretentious as all getout. If this is something that sounds boring to you, then obviously it's not gonna do it for you in a game. I don't want to sound like a jerk, I'm just like, I'd rather hear people label Narr as "Some dumb thing nobody cares about" than describe it as something it isn't.
Safest thing is to ust stick to the old GDS theory and go with that. Since those terms were never defined, you can go nuts with it.

I have no idea what Dramatism is, neither does anybody else as far as I can tell, so it's certainly an open topic for debate!