Dhoni is 26, with over 20 tests and 80 one dayers under his belt. He is also a certainty in both sides.
Besides, to perform well against Australia we will need superlative individual performances. Our only consistent batsmen of recent times were Dravid, Ganguly and Tendulkar (both forms). Whatever Dravid's recent performances, it is hard to deny that he is the most likely guy to score big (150s and 200s) against Australia later this year. On field captaincy becomes a bit less important under such tough competetion where Australia is super-skilled. Nobody can deny Australia is winning based on skills and not on captaincy. Off the field, Dhoni will be well guided by so many experienced guys in the team with respect to team selection and toss decisions.
I think we are in the best possible position to deal with the season ahead, under the given circumstances. Let's back the team.