I came across this fascinating article today on Ars Technica about a new version of the AmigaOS, AmigaOS 4.1. It's well worth a read. AmigaOS 4.1 looks to be as polished as any modern operating system.
I'm really surprised the Amiga didn't survive to the present. I always hear great things about AmigaOS in terms of how powerful it was, and it always had a fantastic range of games (apparently it was very easy to develop for). And, of course they were used with Video Toasters to create the special effects in sci-fi series such as Babylon 5. It was a powerful but inexpensive computer that did it all - gaming, multimedia, you name it. In fact, it was arguably a better gaming platform than a Windows PC at the time. I can't think of a single game available for the PC that wasn't on the Amiga at the time, while I can think of plenty of Amiga games that weren't available for the PC.
Put it this way, when I was a kid loads of people I knew had a Commodore Amiga, whereas I didn't know a single person who owned a Mac (and I never used one until 1995, when I was at sixth fom). Surely, if Apple survived, Commodore should have thrived.