Also,this does not seem to be a market where small players are trying to unseat a large incumbent. Strategically, Google, Microsoft, Apple, Dropbox and Box are

Also,this does not seem to be a market where small players are trying to unseat a large incumbent. Strategically, Google, Microsoft, Apple, Dropbox and Box are all in incredibly strong positions. Thus the market is unlikely to consolidate into one or two platforms for a long time. It may very well be that we see a similar pattern as we saw in evolution of PC platforms where it took decades before Mac, Windows and Linux emerged as the dominant standards. Even then, developers have had to work on cross platform compatibility for a while now.