Its a very sensible decision by tendulkar and there may be many factors supporting the cause:
1. If Dhoni wins the ODI series and Tendulkar loses or draws the Test series, people will blame him n will expect his head. 2. Being him the captain is itself a backward step. 3. Today he may be captain but for how long? One two or three years...after that he would lose both - the respect as well as the tag of Batting Maestro. 4. he is not a natural leader 5. We love his batting and expect him to be the greatest 'batsman' ever......