I believe the change should start from consumers, especially big institutions. For example, a big municipality or government agency may impose limits on buying new software/hardware that isn't open to refactor/repair by their competitors, to avoid lock-in to a single supplier, operate on more open market, and consequently drive the costs down.
I like the idea. I'm worried that this ship has sailed though as it's becoming harder to even get phones without cryptographically verified bootloaders, and god forbid you want to mess with the baseband/modem source. This is only going to get worse too, as software becomes the part that's actually valuable. AI will mean that everything on the processor will be a trade secret x1000 and everything that can possibly be kept from the local processor will be hidden away in the cloud, forever dependent on continued server access.
