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Probably more about ecosystem compatibility at this point. There are already RISC-V chips that sell for less than a 6502.

I doudbt about that stance, you can have 6502's on every keybard at ridiculous prices.

Supply-chains are more complicated than merely the unit price. Things like existing stock, talent, software, product design, certifications (both chip and products based on chip), and hundreds of other things play just as substantial role.

a cheap 32 bit RISC-V chip like the CH32V003 goes for about $0.10, and the cheapest MCU I've heard of (PMS150C, barely useful for anything) goes for around $0.03

there's little real point in 8 bit chips anymore

Even without special knowledgeon production economics, I dare say there would be a race to produce replacement compatible 8-bit microcontrollers to get people's stuff working again.