That's what I meant. The OS itself is the easiest part, making it popular and gathering 15 years of experience regarding app compatibility, development, etc., in a year or two, that's the hard part.
2 players (iOS and Android) is more than enough (MS lost the war, that is apparent to everyone). Sure diversity is good, but not at all costs. If they make it like you said "hey, you can run Android and iOS apps here, as well as our own apps", sure, I'd say it has a future... a long and hard road ahead, but you can't beat cross app compatibility cuz they'll probably be the 1st on the market to make that work out of the box on their OS. Other than this scenario, I just can't see anything else being a viable option for them ๐คท.
I (mostly) use Linux too, but I have Windows 10 LTSC 2019 on dual boot. I need it for work ๐คท... not all the time, I've replaced most of the things I need, but for some things there is no replacing them (things tied to hardware).