Bollocks
"Secondhand computers have negligible value and can be bought for pocket change from secondhand shops." Take the bits from the ones in your garden shed and fit your Pi to them.
"Broadband is considered an essential service these days, and even poor families have it. So it seems fair to suggest that most households have a computer, even if it’s just for" downloading stuff for the Pi
If there’s a lack of budding programmers in this country, it isn’t because they don’t have access to a computer.
“Everyone can afford a Pi”
But that’s not the only cost, is it? You also need a a machbox, a ummm donnection to an old tv with HDMI input, a power supply, some SD cards, an old USB hub, a not too badly junked keyboard, a mouse that still works~ish, a bit of old network cable, and a fair amount of bedroom flood space. And as a bonus for budding geeks and little children everywhere: it's far messier, too.
Who else is leaving the nest?
Because this authoir has passed the sell by date.
Now, you, the adult geek, probably have most of those extras rattling around in a drawer in your Man Cave. But the Tim Berners-Lee of Tomorrow - who, at this moment, is reading comics and watching Almost Naked Animals - does not. Neither does the overworked IT department of your local school. They can’t just buy a lorry-load of Pis and hand them out - they’d have to find all the other bits too. After that, there’s a whole world of connectivity and support pain.