MSD: is he overworked

I keep having this feeling that MS Dhoni is being seriously stretched as a player and considering how important he has become to the team as a leader and as the keeper-batsman, any injury to him could seriously hamper the progress of our team. for starters, he should be relieved of wicket-keeping in at least some form of the game. I believe that we need to rear one more keeper batsman who can alterante with Dhoni. further, I remember that Dhoni has bowled a few, test match overs and it would be worth a try to let him try out a new role of coming up the order as a pure batsman and thenr rolling over his arm as a part timer, at least in the one-dayers... is Dinesh Karthick even in the frame of things?