Okay, so I was thinking about this and kinda came up with a theory about Undertale and the other AUs that relate to it. I'm not sure if others had thought about this or not.

Basically, my theory is that during the end of the genocide route in Undertale and when you meet Chara, they say "Let's ERASE this pointless world and go onto the next." I hadn't really thought about this until I was actually playing the genocide route. But, my thought was that if the player agrees to ERASE the world and "go onto the next," wouldn't that mean Frisk would go onto the next world, it being an AU? And if so, wouldn't the genocide route be the only way to get to said AU? Because in the neutral route, we assume frisk traveled to the surface and in the true pacifist route, the monsters ate freed.

It's just something I had thought about. I would like to hear your thoughts on this though. Anyway, that's all.