I think it will be a great advantage when versioning is part of the file system and when applications could be written to take advantage of this ability since the application knows the semantic meaning. This would then also solve once
and for all the file type problem.

(There is however much more room for improvement in data storage and retrieval then this alone)

they might expand this to any language where they have an AST, who knows..

Another example where usual diff capabilities of source version control systems fail are Microsoft Word documents which have built-in support for change and user tracking. This is not exploited in any general purpose versioning system I know. I’m sure similar things are provided by various other data formats.