See, I can't agree with a world with no sequels.
You see, one of the prime imperatives with any story, no matter how complete in seeming, is the desire to find out what happens next. Without some copout like "and they all lived happily ever after" on every single story (which anyone beyond the age of about five will see right through anyway), the irresistible desire to know what happens next will only lead to one thing.
Fanfiction. A soul destroying, reality warping glut of fanfiction, which will collapse into a super-black-hole of creative nothingness, destroying all that is pure and good forever.
DO YOU WANT THAT!?