New processor?(upgrade?)

this may sound dumb.
When Apple does indeed switch to Intel couldnt we just buy a new processor?
then instead of being left behind or slowed down we could upgrade?

This is totally incorrect
The processor is not the only thing within a computer that makes it work. There is a chipset of multiple components and lots of traces built into the 'motherboard' that carry out the data/power/error checking.
The PowerPC 970/G5 Architecture uses HyperTransport which uses very few intercommunication wires and a south bridge chip to handle I/O.
The current, and near future Intel line of processors does not use Hyper Transport, and it also requires a north bridge chip to handle processor to memory, and processor to south bridge communication.
Not to mention all new, and totally different traces, and most likely as well different memory. Unless it changed recently IA32/x86-64 architectures use parity memory and Mac architectures use non-parity so all the memory is incompatible/wrong speed.
The only things really in your system built today that could theoretically work in the future would be teh SATA drive, and the Airport Extreme card if you have one. Most everything else would be different completely.
There is no way to make that type of an architecture shift 'upgradable' short of 'rip and replace'

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