well logically we will soon come to a point where we can simulate all 5 senses in a virtual world to the point where thier is no way to tell the observable world from real life.  remember science at it's core is observation of the observable world, so if it could be perfectly copied then whose to say your original existence isn't in of itself a copy? even right now you can take psychedelics and fundamentally shift your own perspective with just a few chemicals.
United States