I don't know what I'd do with all the extra money, because it always finds a way to get spent, but I'm not sure I'm sold on the fact, that it's in my best interest to do so.
Let's take for example a big company with loads of designers. They could call in and turn on if they hired two new people or off if they fired one last month accordingly without having to be outright buying all these programs and sitting on them from time to time. Also, I imagine, as Jeremy here said, it would really thwart piracy, which is a big problem with many of these software programs, especially the good ones. However, while you hafta be online while using it, what happens if your connection goes down for whatever reason. Are you dead in the water ?? At someone else's mercy ?? Hmmmmm ?? What happens if you don't pay the subscription by mistake..... does your software go on the blink for a day or two, until you're set up again ??
Nope, I like having the real hard concrete stuff in my grimy little paws and having full control. Anything I can bring in-house and have complete control and quality control over is usually in my best interest.
The only good thing I can see is..... if the whole world did it, at least we'd all be on the same version and wouldn't have problems going back & forth with files and no outta date software which wouldn't be supported anymore. We'd all be on a level playing field, huh ??