OK, no prob! (I do care about everything that exists. I am not particularly certain that all mathematically possible universes exist, or how much they exist if they do. I do expect that our own universe is spatially and in several other ways physically infinite or physically very big. I don't see this as a good argument against the fun of having children. I do see it as a good counterargument to creating children for the sole purpose of making sure that mindspace is fully explored, or because larger populations of the universe are good qua good. This has nothing to do with the reason I'm not having kids right now.)