I'm pretty sure the ATPL theory syllabus still uses the 767 and even the pre-historic 727 as the aircraft studied. Not very relevant as the number of 727s (and similar Jets) still flying commercially in Australia can be counted on one hand
Whilst I don't disagree with what you're saying, you could use any aircraft for ATPL flight planning and the concepts would pretty much be the same. So I don't see what benefit changing the type of aircraft would have, other than costing more money which CASA already swipes from us.
morno