Well no one is holding a gun to anyone's head and forcing them to use AROS. You don't have to make any form of comitment to try it out... well, maybe a CD-R. If you try it and you like, great! if you try it and you don't like it, great, use something else!
I don't think that any of the Amigoid OS's have much of a "future"... and certainly, now MacOSX is running on sensible hardware, I doubt any OS is ever going to be able to keep up.
What the Amigoids do have, is a place in the hobby market... however one chooses to go about their hobby is up to them. I prefer not to spend 1000s of pound to support my computing hobby, I like it to be an off shoot of my personal and work related computing work. Only AROS can fill that role for me (and quite a few others)... thus it has a future!