2 scenarios next season: 1) Feed Messi at all costs and change very little with tactics 2) Enrique brings new tactics to suit all forwards, create challenge, unlock the bus, distribute the ball as a team.
In scenario 1) Get Alexis and Pedro the hell out. They have had enough of being water boys and deserve better. In this hopeless scenario, I'd much rather see injected hunger from Masia kids than have to see senior players scramble to service Messi any longer.
In scenario 2) Get rid of one of Pedro or Alexis based on who has a better WC. Pedro has done more historically for the club by a long shot but Alexis has been more useful recently. I'd give the nod to whomever seems more hungry at this point, and no better than the WC to gauge that hunger.