Will in future user interfaces all be the same again?
Just a few years ago the most common OSs, including Mac OS, Windows and even some Linux distributions, had a very similar interface. So at least the key features as for example a desktop, windows with a menu bar at the top, another general bar at the bottom and so on, had been available in nearly all of them. But that changed with the rise of smartphones. Of course iOS and Android are still looking pretty similar, but Microsoft however is trying to succeed with a completely different, new interface. I'm just thinking of the new start-screen, live-tiles, charms, lateral scrolling... So I'm really asking myself whether the current available choice of different UIs will remain in future or whether one interface will kind of win the battle and in ten years we're all going to work with live tiles for example.
I guess this highly depends on the mobile market share. When Microsoft for example will still have just a few percents on mobile market in five years, then they're probably going to orientate much more on their competitors ideas and maybe even drop the whole Metro-style idea. The same vice versa if for example Google or Apple will loose too much users. But when every platform would have for example a quarter of market share, they would not drop their ideas and guidelines, but try to point the advantages of their interfaces even more out to gain the majority of users. So at last I really have no clue what would be the better option. Of course a big variety of different OSs and ideas would be great, but this would also lead to a lot of problems.