He's already played for PSV so he wouldnt be a one club man. I would expect him to go and spend his twilight years somewhere else, as many, like Evra, Ferdinand or Park did. But if he wants to go to Spain for his peak years, that is something else.
That is not to say I would resent him for it. He is well within his rights. And of course Ill be happy if he emulates the other side of Ronaldo - his brilliance - although of course wanting to play in Spain like Ronaldo does not make it more likely that you will become the player Ronaldo is.
Just disappointing when someone arrives and they already have their eye on another goal, beyond playing for United. We usually like to think playing for us is the height of someone's ambition, we arent used to people seeing us as a stepping stone. I dont know if he does, I dont know how much credence to give to this, perhaps throwaway remark. But its something to consider.