I'll start off by saying I'm a big Tai fan and all he "has done". And that's the trouble, as each year passes without a World Championship, a credible challenge or even a GP win sooner or later you have to back up what you say you're going to do with some actions.
For me, and it'll never happen in a million years, he needs to be dropped from the series if he doesn't finish top 6, for his own good. You can tell by his demeanour in the pits that he's far too comfortable with himself and seems to have an air of entitlement that he should be there, I don't think he does the GP qualifiers does he? Have a mediocre season (by his standards) get a wildcard, rinse and repeat.
Maybe a spell on the outside looking in will be the kick up the @rse he needs?