Realistically looking at situation,Ganguly as sohum says,is not going to be a probable for 2011.Also,it would help alleviate problems if he & Dravid retire altogether from ODI's.
For 2011,I do not see Dravid,Laxman and Sourav playing and neither do I see Sachin playing.It makes sense to drop the Big 4 from the ODI's.Yes,the gap will be humongous,but you do have the likes of Rohit Sharma,Tiwary,Raina,Pujara,Dhawan[just to name a few] coming up.
So,if the youngster are given a free reign and allowed to play atleast 70-80 ODIs till the 2011 WC,obviously,by then,they will have become senior players.
Also,they will be experienced too.
Yes,initially,the team may lose a few games[or it may win them too],but I feel this is a step in the right direction from the Former India Captain and i should expect others to follow suit.
Regd Test matches,the Big 4 should continue till their bodies allow them to.By 2010,i'm sure the Big 5[add Kumble] will retire.Occasionally including the youngsters will definately help.