I think you are right that there is one entity who will come up with a uniform solution which will just get everybody to adhere to their set standard. What I fail to believe is that this is going to be a language or a SDK.
Instead the real war in the internet will be who will keep your data together and present it to you in a uniform way. This step is already being taken by google with their whole integrate gmail, docs, calendar,... suite. What we are seeing the real Web OS being built and this is not any crap proclaiming to be WebOS.