This reminds me of a scenario that I've played in my mind many years ago. If everyone did not exist other than me, well sure that might solve a lot of problems, but since I'm still a human being in a meat suit, I'd still succumb to diseases, nature, other things that could cause suffering. Also, I think if a human being is deprived of human contact long enough, the human being may start to go insane due to lack of social contact. Even introverts need some social contact in order to remain sane (from what I've deduced).