Maybe it is the right way for him to leave and yes, I am a Barca fan.
You see, IF Tito won't let Thiago play enough next season, Thiago would have get seriously no chance to compete in the WC next year. We all saw what can happen to a football player with the injury of Badstuber (out for at least 1 year) and we all know that players could lose the form after their injury (Villa, Torres).
Thiago is a diamond, not a raw-diamond, he already shines. He deserves to get a starting-spot. I say this as a football fan because in the next years, he could become one of the world's best. Even though it would be a massive loss for Barca, the board is to blame and we all know that and we should not blame him because he deserves what he does not get here.
So, if Bayern or Manu or whoever offers him a good contract, he should leave, only for his aim to compete in the WC 2014 and onwards.