Why would it be bad? First of all, Zlatan is one of those players who will gracefully age. He has never exactly relied on his speed to become the player he is.
Second, its Ibra, he will NOT be here for all of these 4 years, you'll probably find him in America after 2 years.
That depends on when his PsG deal runs till Hoori. If his PsG deal runs till 2016 then he is taking a fair cut. That apart, I think we'll offer him a 3 year contract with an option to extend to the fourth if the parties mutually agree at the time. I can see him stay active and play till he's 35. He's not one who relies on speed.