One day my heart may stop, and then I won't be able to play any games at all. Whats your point? I have bought many games over the years that I can't play anymore. I have sitting on my desk right now the CD Case for Homeworld: Cataclysm without a disk in it. I have no idea where the disc is. Thus I have a license to play it; I own it in every sense of the word as it is used for software, but I can not play it without downloading the iso and a third party CD crack for it. When Steam does die then if it is the only form of DRM on these games, the single point of failure that you decry, then people will be able to break the protection for all the games with a single stroke by breaking the Steam DRM.