i wonder if one day we will see a third mobile OS become popular. Mobile OS has completely stagnated that there's just nothing new coming out now. i remember when i used to swap gallery apps so frequently as every 2 months the latest and greatest gallery app had come out. launchers, keyboards, mail, texts, social media apps etc were all going places at such a crazy speed it was hard to keep up. but now it's just so dull. and for a good reason. apps and the OS now are so flipping fantastic, but it's dull. i got my new pixel xl a couple weeks ago. same apps, same everything other than the wallpaper as i want it to feel new and not the exact same phone i just had, but because the apps have become so great now there's just no options in the sense that they all are pretty decent so you just pick the one that most appeals and stick with it. there's no real downsides like there used to be that caused a choice.
and because things like instagram rule the image sharing scene, whatsapp rule the instant message devs are left to develop nothing new.
a new OS would definitely spice things up and be a place for the devs to create and race for the market share. of course as soon as a mobile OS gets a good share of the market, facebook insta and whatsapp will jump in, create an app and kill any innovation, but still will be a place for more innovation that IOS and android just doesn't have any more.