If people can be convinced that their simulated virtual self is actually them, overpopulation will be solved by mass suicide. Sorry if that's too dark for you guys, it just has to be said. All these "live inside a computer people" are just a modern Jim Jones cult.
But how the universe actually works is irrelevant even. Other people can have a different definition of 'death'. If the information in my brain is preserved then that's all that matters to me. If I had to get my neurons replaced, one at a time, with 'artificial neurons' that would contain all the same information, then i would do it. Surely you would to. And you wouldn't even notice any change I bet. It wouldn't change anything observable at all. So how can it possibly matter?