Google closed off the market with Android One. In another world they couldn't get it together, or weren't interested in low margin competition. Firefox OS was a reasonable bet, it could have paid off, even if the technology was manifestly limited at the time. I actually wish they'd kept it going as an ongoing experiment, with a very low budget, once they'd done the work to get it running on a device like the Nexus 5, you'd have thought improvements would flow almost automatically from the work on the browser.