Dah! One match doesn't proves up that a player is ready for world cup. He still needs to pick up consistency. Consistency is key but if you have something extra in package like Dhoni has (I mean the guy is full with working strategies) then there is no doubt that selectors would pick him.
RR are still in the game and I would really hate to see efforts of middle order batsman of RR getting ruined.
Dhoni along with Kohli are the key players in the World cup squad. He has proven his consistency over a long period of time(Check his statistics). This man has, will and shall always be the pillar of the Indian squad.
I am not saying that he will not be selected. I am talking about judging selection on the basis of one match performance. Of course he will be selected no doubt.
Check again what I said above.