It's important to understand that we could genuinely lose general purpose computing. I don't think it's in serious danger at the moment, but we've been in the midst of a slide in that direction for the last 10-15 years. Part of it is mobile phones, part of it is TPM, part of it is market forces. The latest turn is strictly political. We've really foolishly built the technology necessary for authoritarianism just a fe…
Somewhat related, but if x86 loses dominance it will be even more difficult if not impossible to install Linux or other alternate OS's on ARM devices. The majority of consumer ARM electronics make it hard enough, and normally requires you to run a specific patched (and most likely outdated) Linux kernel in order to boot.
There are ARM devices which meet the ARM System Ready standard which allows you to boot whatever OS you want, but they are mostly enterprise devices such as servers. Cheapest one I've seen which your average consumer might buy was an ARM workstation with a starting price of about $1500