That argument makes no sense. Just because something only affects those that enjoy a particular hobby does not mean that those consumers don't deserve protection. This also isn't really just about games as other forms of copyrighted content also often disappear when the would-be owners can't be bothered to keep it available.

Remember that copyright which is only allowed to exist because we think it will result in more creative works that will eventually be part of the commons. If a company is taking active steps to take something away then they are abusing this deal and should forfeit any copyrights.