Never.
Not the ANET politics.
Also, even they remove some files from the .dat, it's clearly has no space for an extensioninfos about dat limits were said by Bill. i dont speculate like you.
I do not know what your issue is, but I think you are missing the whole point. I am not speculating but simply implying that guild wars will never have any content update unless it does release the source and the community can create it. which as you also state will most likely never happen.
Also with regards to DAT limits, its a file structure which can always be changed. its not Impossible. That's a very strong word.