This would be the method of last resort. I think secure boot as a technology actually has security advantages,
if you can freely set the keys. That was what the tech was advertised as to console the critics, but if course it would run counter to the goal of controlling hardware if this was actually implemented consistently. I think regulation to force vendors to provide this option (and in a frictionless, actually usable manner) could do a lot here.
Second is more focus on nag screens, "nudges" and other deliberately degraded UX. I.e. with the Surface tablets, you're technically able to disable secure boot, however you'll then be greeted with an ugly bright red boot screen every time you turn the device on. This stuff can have significant psychological impact, especially for "casual" users.