Australia started struggling since those chain retirements and they really do miss John Buchanan.
Greg Chappell has nothing to do with this. He just helps batsmen to get used to Indian pitches.
And btw, don't draw too much from the Mohali test match. Yes, the team was in disarray. But many times they bounced back.
Remember, before the 2007 World cup New Zealand won home ODI series with Australia 3-0 (a whitewash). Then everyone thought that Australia has become weak but in the world cup, they were unbeaten.
Australia will lose Border-Gavaskar trophy this time and that is for sure. India won last 7 test matches played in Delhi. But they will bounce back after the India tour and will be back into their winning ways.