The first version of OS X was running on x86 architecture inside Apple. The famous "just in case scenario". Nobody else, except the folks at Apple, knew about this.It's not unlikely that Apple tests OS X on other CPU architectures, including the latest PPC. The only claims I've seen that Apple will switch back are from people who miss the good old PPC days.
Nobody can predict that Intel will keep up in the future. I'm sure that Apple would switch again, not necessarily to PPC, when it would be necessary.
I love the PPC architecture and I do understand why Apple switched to Intel.
It was/is a very good move from Apple. They could be bankrupted by now if they would not made the switch back then...
I do not understand why they dropping PPC G5 support in Snow Leopard or even in parts of the latest iLife'09 ((GarageBand) Even a 6 year old PM G4 with a decent GPU & 1Gb RAM runs those lessons smooth)) for the people who boughted the latest PRO Macs during the switch. The G5 was the first 64 bit processor introduced by Apple and the chip will never be able to unveil it's full potential. Maybe it's a strategy from Apple? Maybe a Quad G5, running Snow Leopard and utilizing OpenCL, surpassed some (or maybe many) of the newer current Intel Macs in the Apple labs? Who will say and who knows...
I still believe it's not fair for those "G5 PPC folks", which supported Apple during the switch by buying their costly PPC tophardware. During that same switch Apple even updated those machines with dualcore & quadcore G5 processors (check Mactracker for dates and compare them here)! And that's why it's also a bad PR move.
Imagine that Apple would drop Snow Leopard support for the first MacPro (introduced in Aug. 2006 and discontinued only a year ago) users! Can you imagine how those people would react? I would love to read the comments from those who are writing now to just move on and to buy a new MacPro