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If I recall correctly, one of the reasons for the excitement over RISC-V is that, like ARM, they are both RISC-based chips, so while there are different ISAs, there's less friction in conversion there than there would be jumping between ARM (RISC) and x86 (CISC). Nintendo's familiarity with RISC designs is probably why the jump from Wii U's PowerPC architecture (also a RISC ISA) did not see all that many hiccups. It's a lot more doable, is what I'm saying.
But as mentioned, it's a very VERY future-looking topic. RISC-V's current benefits to electronics makers is cutting into ARM's currently massive piece of the ASIC/microcontroller market (basically, the Cortex-M series), which is moving at an exceptional clip, but moves to get it running for broader application use (and competing with Cortex-A, for example) seem to keep stalling out or falling behind.
But as mentioned, it's a very VERY future-looking topic. RISC-V's current benefits to electronics makers is cutting into ARM's currently massive piece of the ASIC/microcontroller market (basically, the Cortex-M series), which is moving at an exceptional clip, but moves to get it running for broader application use (and competing with Cortex-A, for example) seem to keep stalling out or falling behind.