It's not systems that can be updated that are the problem, it's embedder electronics. Desktops have no where near enough life span to be a problem, most servers

It's not systems that can be updated that are the problem, it's embedder electronics. Desktops have no where near enough life span to be a problem, most servers will be updated before then due to advances in electronics. Embedded electronics can usually only be updated by replacing the entire machine and are written to be as simple, so many systems could be vulnerable to this bug. When you think of things like cars and and even microwaves, this starts to become rather probable.