Awww such passion!
she is a great fan both for Argentina and Leo
I strongly believe it is not his laziness that we are seeing. If Messi had turned lazy we would have seen it in other aspects of his game and also in his fitness level. however we see that He has kept very fit and has shown form when the team has called upon his brilliance.
The main issue with Messi's current way of playing stems from bad coaching and instability of his teams IMO.; Up until the ends of the Tito year he still would run more, but when Tata came on things changed. Sabella has obviously not addressed this seriously either.
It is also possible that omitting messi from pressing and tracking back has been part of the plan to give Messi more freedom of action and energy for when it is most needed (getting ball to messi not messi to ball) and it would have been a good plan for certain matches but you can not keep playing your player in a role with a limited definition and expect wonders every game so you need variety; However the last two years, it seems the coaches have lost the plot and forgotten to keep the balance in every part of their plans, resulting in Messi's repetitive role and gradual lessening of movements.
Messi have been playing like this for more than a year and non of the coaches have shown any problems with it, so he kept playing the way he is now. All we truely need is a coach with a new plan to take Messi into a more active role.