hmm??
What are eyetech and Hyperion doing?
For full G4 AltiVec support, you'll need GCC 3.1 which knows very well how to work. Unfortunately, it's not binary compatible to GCC 2.95 (which Hyperion are using now) which means binary incompatible - so I imaging you will see support for G4 only at AOS 5.0 (I think Amiga can, just like Unix, put 2 different libraries without breaking each other on the same path, but not sure...)
Regarding G4 pricing - as much as I know - Apple needs about 200-300 trays of G4 (meaning 200,000-300,000) and I'm pretty sure Motorola pumps out more processors then that, so why all the delay to move to G4?
Also, eyetech could just turn to IBM for the processor supplies - IBM could supply it to them (IBM already manufactures it for Nintendo for their gamecube very cheaply)..
Hetz