Well he supposedly wasn't happy last year but still ended up top scorer in the Prem.IF you can keep him happy - which it looks like 90% of teams that can afford him cant!!!
He isnt good enough to make all the agro worth it , over the short time any 1 team will have him (compared to his transfer / wage demands)
He won't be leaving now and Aguero is coming in so Aguero+Tev partnership next year with Balotelli and Dzeko also rotating. Unless Mancini sends Tevez to Argentina until January where he can move to Corinthians.