The ARM processor, which is the dominant microprocessor for low-power devices, is an indirect descendant of the 6502.
An insightful report by The Register explains, "[Sophie] Wilson's affection for the 6502 also took them, in October of 1983, to the Western Design Centre in Phoenix, Arizona, where Bill Mensch was working on a version of the chip that would support 24-bit addressing.
The place was a revelation. As [Steve] Furber recalls: 'We went there expecting big shiny American office buildings with lots of glass windows, fancy copy machines... And what we found was... a bungalow in the suburbs... Yeah, they'd got some big equipment, but they were basically doing this [enhanced 6502] on Apple IIs.' ... As Wilson tells it: 'A couple of senior engineers, and a bunch of college kids... were designing this [enhanced 6502] thing... We left that building utterly convinced that designing processors was simple.'
Simple? IBM's own commercially unsuccessful first attempt at a Risc processor had taken months of instruction set simulation on heavy mainframes. Wilson, however, just plunged right in. Herman Hauser remembers: 'Sophie did it all in her brain.'"
In other words, the visit to the Western Design Centre, where the enhanced 6502 was being developed, helped Sophie Wilson to realize that a simple yet powerful processor can be designed and implemented by her small team of 3 engineers. She did not need the army of H-1B visa holders that Intel uses. She and her 2 British colleagues (Steve Furber and Hermann Hauser) were sufficient if she made the instruction set architecture (and its implementation) simple.
A benefit of simplicity is low-power consumption. The first incarnation of ARM consumed so little power that it could operate with only the leakage current of the logic circuit to which it was attached.
Another perspective of 6502 and ARM appears in the transcript of an interview with Sophie Wilson.