Agree that we have bigger problems that the big Pole (although he should not be 1st team) and Vermealen.
For the moment I like Rosicky. He is not a world class player but one of the few players who can fill in for Cazorla or Ramsey in terms of creativity and distribution. A good player to have give valuable minutes of rest to Cazorla and or Wilshire.
I would not be surprised of next year this time (or sooner) Cazorla will be burned out. He gets too many minutes IMO.