My issue with considering Nash to be the heir apparent for GM is not because of Nash's qualities or bona fides. I take issue with the process itself.
This would be like Calgary saying a year ago that they will draft Tij Iginla with their 1st round pick regardless of how he does as long as he's available. Sure, he might prove to be a 1st round talent. Sure, he might end up being a good player. But that's not how teams that are good run things. Good teams draft the best player available. Good teams hire the best GM candidate available. They don't play favorites and they don't forecast or make promises.