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As we all know the battle of the processors was won by the Intel x86 series on the CISC side and various flavours of ARMs on the RISC side. Motorola's 68K chip was pretty much doomed to obscurity once Apple dropped it in favour of PPCs (which they later dropped in favour of x86s) and Atari and Commodore went out of business. Likewise Apple's decision to drop the PPC has lead to its demise as a serious contender in the market now dominated by ARM.
So. What would it take for both to be still competitive with Intel and ARM's offerings? Or even dominant.