People say that Android won't last until a letter "Z" dessert.. So what's next?

People say that Android won't last the next ten years or so.. So the question that popped up in my head was, then what will replace it? It was just a random thought that came to my mind so i was a bit curious as to what others would want as the next greatest (arguably) OS?

So basically what would your dream OS be? and what do you think is in store for us in the next ten years?