Cristiano Ronaldo Transfer to Real Madrid, Why not ?

If Cristiano Ronaldo wants to be transferred to Real Madrid from Manchester United, why not ? there are 4 reasons why i agree if Cristiano Ronaldo wants to go :

• Every football players have rights to decide their own future. Cristiano Ronaldo should be the one who decide his future, not Manchester United.
• Manchester United has Nani. He has the same playing style with Cristiano Ronaldo.
• Besides Man Utd, Real Madrid is also my favorite football clubs.
• I am curious about who would replace Cristiano Ronaldo and wear MU no. 7 jersey. I bet Sir Alex Ferguson is capable to find his replacement.

So, if Cristiano Ronaldo wants to leave, why not ? but i prefer for him to stay in Manchester United. Any views ?