How will he be unproven in the championship. He has absolutely tore it apart. I don't understand your pointHis personal value will improve far, far more playing in the premiership even if Ipswich end up relegated. Right now he is a top quality championship player, unproven in the top flight. He isn't going to enhance his reputation to gain a better move or value any further by playing another year in the championship, as he will still be unproven in the championship.
Only way he stays is if we turn down all offers, can't see that as that would leave us very vulnerable next year contract wise, or, as you've said, he's been burned by his previous experience at spurs