I think it depends on the adoption of Linux on the desktop. When more people get a taste of what freedom of software brings, they are going to want that for their phones as well.
That or we might just be years away from the next big thing where everyone walks around with AR glasses and the cycle starts all over again with companies competing for a duopoly, and we’re just fucked.
Wait, what does the onion do in this scenario? That seems oddly specific.