I see. Here's the thing, I still think that the analogy of Pulp Fiction is wrong to use because film's are too... singular a narrative. It might work if I was making a kinetic novel, but I'm not. To better demonstrate my point, take Mass Effect 3, it's a very dour, serious game and it is tonally consistent through all of the paths which were implemented in the base game. But the Citadel DLC? It's very humorous, almost contrary to the tone of the rest of the game. Yet it doesn't affect the rest of the game and that game is immutable without it.
But as for your suggestion, you're right. I absolutely could do that and I'm not going to rule out doing so because to give you another video game example, Halo ODST was originally just supposed to be DLC and it became its own game. Or maybe look at Hungover Cat's office game, it split into two games I believe.