I always figured that an "average" comupter user does email, browses the web, and sucks pics off their digital camera (but few of them actually retouch the pics), and maybe play some games (nothing serious for the "average" user). And they may type a simple document every now and then, or have a spreadsheet that adds the contents of a couple cells. So the needs of the average user aren't that great.
I myself have a vast amount of other things I do on a PC, some of which most folks here probably aren't even familiar with. And I don't expect that most of them will ever be possible on a "new Amiga" (you can't do many of them on a Mac...).
But I would still love to have a "Amiga" with more modern capabilities. People are purchasing SAM's, and old Mac's to run MorphOS. And running AROS and UAE. So there seems to be an appreciable market there. Pickup some non-Amgia-tard, "average users", and that sweetens the market.
A new Amiga wouldn't need to be a giant killer, and storm the market. And if it could gain a foothold, maybe the size of the niche would grow. But there is a time window that needs to be addressed... The new machine needs to materialize before all the old Amiga-tards die off, so that market can be used to gain a foothold.
As James Earl Jones told Kevin Kostner in Field of Dreams - "Oh... people will come Ray." ;-)