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ARM has already succeeded. There is no "will" here. Most microcontrollers in the world are ARM. Most application processors in the world are ARM. It spans from the cheapest to the highest-performing parts. Nearly every smartphone in the world is ARM.

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In the embedded arena, Arm (the instruction set) would appear to be pretty replaceable. Arm and MIPS competed for the same business, Arm and RISC-V can do the same. There is nothing magical about any of them.

Arm (the corporation) can make some money for themselves by coming up with increasingly cool Arm cores to sell (a mission Nvidia could have aided immediately and with high impact, but... nevermind) but the instruction set itself is not especially important anymore. There's a lot less path-dependency for companies in the embedded arena than there is among, for example, desktop computer companies.

AArch64 is very, very late to the game, and has a lot to prove (beyond mobile).

The older architectures were much earlier (MIPS64 1991, SPARC64 1995, Itanium 2001, AMD64 2003, AArch64 2011).

Yes, AArch64 runs the top supercomputer, and there is enthusiasm; don't mistake this for market share.

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