The problem is that this is 2008 not 1988. OS X and Windows have a lock on the market. Even Linux can't make it to the desktop in large numbers.
The main issues confronting any new OS are:
1) Software, can I open a .docx or .xlsx file, edit it and returned the marked up document? Can I play the latest games? Can I edit my photos and videos? Can sync my phones address book with the one on my computer? Can I play a modern game? The answer to these for AmigaDos 4.1 is NO, for all practical purposes. Heck I can't really even surf the web properly.
2) Bang for the Buck. Is it affordable for me to make the switch? Is the price performance ratio good? Again, if the Sam card the answer is a definite NO. The price/performance ratio is bad against Mac and horrible against PC.
3) Stability of he supply, if I'm buying something non-standard will the company be around next year? History probably works against Amiga here.
4) Technology leap, this was Amigas original strength. But nothing in AmigaDos says cutting edge, indeed AmigaDos 4.1 is still not up to 2008 trailing edge.
So in the end who will buy an Amiga? Retro-Geek and hobbyists, a nice niche market but really only in the thousands of people It isn't pessimism, that's realism.
I may buy a SAM for play but they have to pry my MacPro from my cold dead hands. I love 1988, but I live in 2008. With Amiga I can relive 1988, but when there's work to do the Amiga simply can't cut it.