Why did the Motorola 68000 processor family fall out of use in PCs?
Lots of excellent answers but this is the best response that gets to the core of the question (don’t know how to make a link to an answer, so pasting it here):> Processor architectures come and go. The history of the 68k architecture is perfectly normal. It's the x86 that's anomalous. I believe that is the result of Microsoft's peculiar inability to switch architectures. No other software company seems so stuck: they move opportunistically to whatever architecture suits their immediate needs. Apple has evolved 6502->68k->PPC->x86->ARM. – 
John Doty Sep 25 at 12:14