That energy he'll spend doing this, means a drop in finishing, means sloppier touches and more errant passes. It means less late game heroics because the player is going to be running on fumes towards the end of the game.
There is a reason that as Messi's work rate declined, his scoring output and his efficiency increased. Even despite the downward trend in the team's overall performance. He conserved his energy to be a better and more reliable scorer.
You want more work rate and sacrifice from him, ok. But be prepapred to deal with the tradeoff. Be prepared to supplement that tradeoff with other players.
There's a fine and fairly reconizable line between playing the defensive side of the game and running yourself into the ground from effort. Never suggested he run about like Rooney or Tevez with his head cut off.
The perfect example is Iniesta. Not known for his ball winning skills by any means but he still puts in the effort and tries to be in the right place. His physical attributes obviously don't make him a Makalele in that department but he every now and then he wins a tackle and launches an attack off of a transition.
That's all I'm asking Messi to do and it will only help him create even more chances to score goals. When the play is away from Messi, I have no problem with him walking a bit and conserving himself then but when the ball is in a 15 foot radius of him, he needs to put in some defensive effort for the sake of the team. There are times when he watches and walks while an opponent has the ball right in front of him. Nonsense, any other striker in the world would be pressing at least slightly to win the ball back and right now Messi rarely does that.
At Barça if this means "less heroics" but it helps the team stay organized and compact off the ball, if anything it helps put players like Neymar and Alexis to be the hero.
The team in general needs to be less Messi centric and Messi needs to put in more effort off the ball for the team. That's not asking too much and it's the mentality Lucho needs to encorporate into the entire team next season, including Messi.
Still Messiah tho, no doubt. His two golazos have been gems and I hope he kicks it up when the chips are down later in the tournament.