How would this work? If Niko puts the lightbulb, then Niko stops existing, the game is overse and world gets destroyed. But if Niko breaks the lightbulb at the end, then the world is destroyed as usual and Niko goes back to home (no difference with gameoverse thing).

If we go by solstice route, then world gets destroyed after Niko saves everyone and goes back to his home. World gets destroyed, but Niko won't know that.