If everyone was 100% origional, all the good ideas would be taken, and software would be limited.

Well, yeah, except that the point is it doesn’t necessarily take 100% originality to make an idea a good one. (And, of course, that what looks like one idea is usually a conglomeration of many more ideas than that.)

Especially since Microsoft stole ideas from Mac OS X for Windows Vista, which looks flashy but sucks in many ways.

Idea-stealing is hardly the issue at play, here. Everyone who does anything even remotely interesting has “stolen ideas” from someone else. Apple stole the idea for “Dashboard” from Konfabulator, Apple stole the idea for Backup from Microsoft’s System Restore, Apple stole the idea of a graphically-based “desktop” computer from research done at Xerox PARC, and everyone steals everything from everyone else on the web.

The nature of software’s evolutionary advance is precisely that: small, iterative evolutionary steps built off the ideas of things that came before. The fact that computer technology evolution is seemingly “so fast” does not make it revolutionary by any means—despite what the marketing department would have you believe. ;)