If you were Chris Froome
would you consider leaving sky? He is 27 and could win the Tour De France. However, while Wiggins 32 (could easily have 3 more years) is around Froome wont get the chance to go for it. Last year he should have won the vuelta, however due to team orders he had to wait for Wiggins.
If I were him, I would have a meeting at the end of the season and set out my ambitions. I.E team leader for at least the Giro.