People who actually want a personal computer they can program are a niche market, albeit vastly larger than in 1982. And it's a good thing they exist, because most users of modern CPUs have no idea or interest whatsoever—it's just a phone to them.
@swelljoe @mos_8502 The nearest thing to that currently in existence is the Raspberry Pi—which, with 68 million units sold, *is* on that kind of scale. Except each new iPhone generation outsells it by more than an order of magnitude.