I think Billy has helped get some good players to come to ISU. I also think he needs to have head coaching experience before he becomes head coach here. As long as Jamie is AD I feel when Bill retires we will see someone who is NOT part of this current staff.
If Billy really wants the job he needs to go and coach for someone else for a few years. Maybe get a head coaching job also. He needs 5 years (give or take) away from his dad. The lack of recent outside experience should disqualify him from getting the job. Just like Mouser with football.