i love the amigaos, i really do. but amigaos 5 NEEDS to be on x86 hardware if it is gonna survive. whenever amiga os 4 comes out anytime soon is not realy the issue. the problem is hardware (and yes i have got an amiga with a blizzard ppc card, blizzardvision gfx card and {bleep} loads of memory in the biggest case you have ever seen!! , but it sits in the cupboard, i use uae for my fix) people NEED an OS that is usable and powerful i recon building it for PPC hardware is just another monumental mistake to add to the catalogue.
oh yeah i know about AROS and i love it, (this is not a shameless plug!!)
