I don't think that the OS "war" will necessarily lead to an open, web based standard. It may well be that one of the contenders manages to make their "platform" so irresistible to users that they flock to that one OS, and we all will have another "MS" for a decade or two.

Its also the job of every developer to "guide" the users towards the best choice. More apps should have a browser version, for instance.