What exactly have you "cited"? Sounds like you are relying on some sort of objective evidence.
Prior to becoming a wildly successful college coach at Oregon, Kelly had never been a head coach at any level and had only been an Offensive coordinator for two years at the D-1 level. I would much rather take a chance on an innovative, aggressive young coach than a tired re-tread who has failed with other teams. Why is Kelly such a hot prospect given your assertion that there has never been a successful NFL coach without prior pro experience? Do you think NFL teams are unaware of this "fact"?
He might not make it. And way too progressive for the old school teams. If he makes it, it will take awhile. Buffalo would never interest him unless the financial offer was absurd. Chip Kelly will be good for the league someday.