Right now with Dhoni most likely to lead the side against the touring Australians, India are going to be on a real sticky wicket. Do they select all the seniors and risk seeing the side fluff on the fielding department? Australia will kill you if you are not good on the field. World champions are far more dangerous.
India need to go in with fewer seniors than they normally used to. This means one of the seniors (the holy trio!) must not be played the entire series, and one of the two selected seniors should be rotated within the team. This means that only one senior should play in the final XI for lending the stability to the side. The rest of the players should be youngsters or those who have a long promising future.
I would go for Tendulkar and Dravid for the two seniors to be picked for the series with Ganguly being asked to sit down or dropped. Ganguly loses out on his agility, even though he is a better ODI player than Dravid. Added to that, Sehwag can come in to the team to replace Ganguly and can make an explosive combination with Sachin at the top.
Here is my 15 Indian players based on the situation now
Sachin Tendulkar, Robin Uthappa, Virender Sehwag, Rahul Dravid, Yuvraj Singh, Rohit Sharma, Dinesh Karthik, MS Dhoni, Irfan Pathan, Harbhajan Singh, Piyush Chawla, Zaheer Khan, Sreesanth, RP Singh, Ajit Agarkar
I selected Agarkar coz no other fast bowler is there for us for back up.