There were other reasons why Apple jumped ship and moved completely over to Intel processors. IBM just were not developing PPC processors at the same speed as Intel and Apple could see they were in danger of being left behind. Also Apple needed a mobile G5 processor for their laptops to keep them competitive with Intel PC mobiles and IMB refused to develop a cool running G5 for this purpose as it would have cost them too much in development compared to the return on investment.
IBM however are now much better off without Apple always demanding better processors. Why? They have an exclusive deal with Apple's arch rival Microsoft, supplying PPC cpu's for the Xbox 360. And as it is a console the CPU never needs to have more development done to it, it is a fixed unit so they can just keep turning out the same chip for the life of the console and watch the money roll in.
However, what this does mean is that PPC chip development is probably not focused on development for desktop use at the moment and instead is more likely to be developed for integrated and mobile technology instead. A market where Intel can't really use any of their current desktop or mobile processors, but PPC is ideally suited.
Of course this could be a cool development for the Amiga, if ever anyone decided to exploit it. A mobile Amiga running OS4 on a portable PPC powered platform? Good idea, but I doubt it will come it anything.
BTW, the rumours and initial announcements do hint at Amiga OS5 being a portable OS that will run across multiple platforms. What this actually means is anyone's guess, and we don't even know if OS5 is even related to Workbench. It could just be a confusing name given to the new OS that has been in development for mobile devices anyway, but I hope that isn't the case.





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