That is a cool little video.
Adobe won't be slowing down, though, I'm sure. They're not really selling to private individuals at that price. Just companies. AutoCAD is even worse, but my boss keeps us up to date.
But really, there's not much reason to update every time they do. I think they release so frequently to encourage people to update in a timely fashion. If they did once every three years, then when it was new you'd see sales, but the last 18 months would be people putting it off until the next release.