That's far into the future, and we're not talking of such dire truths here. We're talking about VMWARE fusion. As you can see in the screenshot I've taken on my MBP, I'm running windows in a virtual "bubble" (I require windows for work.) But I had no intention of buying a PC. The alternative would be this.
The virtual software runs like a physical machine but it's not; naturally, it's allocated by disk space. You could infer then, that someone could run multiple machines on one piece of hardware. And you would infer correctly. The only limit is disk space and memory. If someone has a lot of both, they can run as many virtual machines as necessary.
That, in a nutshell, is my VMWARE Fusion.