The people who own the 1% of all Macs ever made that are supported you mean?
For x86 you will need to spend 1000s of man hours going from PPC to x86.....then send 1000s more creating drivers for a fraction of the 1 million component combinations still in use that equal the x86 'standard'. That's the problem....x86 being a standard is an illusion and the Windows registry file he duct tape holding it together[badly].
You know it's funny. Everybody always brings up the thousands of drivers that would need to be written. I really don't think the situation is that dire. How is supporting one type of motherboard (or chipset) plus one or two types of graphics cards and same thing for sound and whatever else any different than buying the (very) few supported cards for a mediator or G-REX.
You don't have to support them all to make it work and we'd still be able to buy the hardware fairly cheaply given it's X86 hardware; much cheaper than buying the PPC hardware. Even if you only supported one video card, one sound card and one motherboard chipset it would be fine as long as you chose common variants to work with.
