Uhm yes it's real? It isn't a theory but rather a fact. Even if we take into account how people are using cryptocurrency today, even if everyone literally started using Bitcoin for everyday use, even if fiat was replaced by fiat, Bitcoin halving is an event that is already in the system that will happen a 100%. That is unless you cut off the internet around the world where no one would be able to connect to it. Just imagine it being a line of code that is set to happen once a set of records/actions is observed.