First, I think following things went wrong in test.
1) India should have lodged full protest to match refree because that was the right thing to do. They have not lodged the protest in the spirit of the game which is bullshit as the umpiring is obviously biased.
2) Playing 4 bowlers, two of them inexperienced Inshant Sharma and RP Singh. I think we atleast need someone who is more experienced like Ajit Agarkar. I know Agarkar has lost India more one day matches by bowling poor, but hey in Australia he would make a better choice than Ishant Sharma. Suddenly they have dropped Agarkar, Sreesanth has a shoulder injury and so Zaheer has also injury and India has no fast bowlers in side. At any day Pathan would be much better player in sydney than Ishant sharma. This test match wasnt about giving chance to youngsters. You do that at home not in hostile foreign country.
3) Playing Jaffer and Yuvraj. After 1st test match, one of them should have been definitely dropped.
4) Kumble bowling 40 over. Kumble was consistently conceding 4 runs an over. Towards end of day yesterday, Australia were scoring briskly and some of Kumble's overs went for 6,7,8. This is a test match buddy. A defensive field would have forced aussies to take risks. At any pace they would not have scored very briskly.
If Kumble does not make necessary changes, he should be seen as a poor captain. We can give him benefit of doubt in this match. Captaincy is about judgement of the person.