Getting the AA for HM does not take long (even per timer). Getting the MoA/faction rank and especially rares takes much longer. And during this time people actually care from time to time to spend time in normal mode group instances.
If every new 80 will have the AAs for hardmodes it will only mean lesser normal modes and many inexperienced and undergeared people with AA aka even more dependance for khitai 6 ppls on tanks and healers

I have several new 80s now with khitai blues and even the AA...but i know that (unless i play a class favoured), it will not work in 6-ppls if there is more than half of my type of players (at least not without a few wipes...and nowadays this means rude behaviour, drama and bad atmosphere in groups

).
On the other hand, if they keep looking at it and adjust the progression curve after 80 still...it might be a start. As illustration take the progression curve y=ax+b. With the actual plan they only change "b" partly...but much more problems come with a badly chosen "a".