Why AmigaOne still use the old slow G4?
If you would rather use your old 68k, noone is forcing you to upgrade. But it IS actually an UPGRADE for Amiga. It's impossible for someone like Amiga/Genesi to expect to be market leaders when it comes to new technology right now. Just won't happen. So either settle for a G4, or buy a PC/Mac. Don't expect a small company to be able to fight Apple etc when it comes to getting the latest chips from people like IBM and Intel.
Note that the AmigaOne was in production by the time the PPC970 was announced...
We shall see what the future brings. For now I'm ok with my 1 1/2 year old 600MHz G3, but I'll upgrade again some time next year. It won't be an Intel, but it might be an Apple. Or an Amiga. Depends on how much trouble the early Apple-adopters have with Linux on the G5 :-)