Why MS dhoni removed from T20?

Sunil Gavaskar said that the Indian team is a definite project for the 2019 World Cup by removing Dhoni from the T20 series against Australia.

‘MS Dhoni’ support, must need in the 2019 World Cup. Dhoni needs a wreck. There is no doubt in this. Dhoni is here to be important because he has a long time to get into 50 over cricket

In the meantime, Rohit Sharma should be a good captain. Rohit Sharma is a well-known thinker. Rohit and Rahane are also capable of captaincy. So there are two more shoulders to more helpful in virat.