Physically I think he's fine. I don't think his head/heart is 100% in it. Part of him is already shacked up with the missus in Sydney and spending his weekends on a couch commenting on football for Fox.
Cronk has never been a naturally gifted footballer, he's had to work extremely hard to have the career he's had. Not saying others don't, but unlike most dominant halfbacks he wouldn't of got part the way there on talent alone. So if his devotion to it is off a bit he'll struggle more I think.
Because of that I'd be wary of signing him. He's not gonna have the same love for any other Club, coach or teammates as he does with Storm and that loyalty to the purple scum keeps him giving at a level I doubt he could find for another side.