Content draughts at the end of an expansion are to be expected. It has aways been that way, it will continue to be that way. Gives people time to clear the last raid of the expansion which is usually the hardest and longest .Then there's the expansion pre-patch.
ToS just opened 3 weeks ago, chances are the last tier won't open until late nov to mid december. So it will last 7-9 months, that's significantly less than ICC, DS, SoO, and HFC. On top of that, Argus is the biggest patch they've ever made.