This is a good discussion, pretty predictable that everyone is going to jump in and point the finger at Prohm, but hopefully doesn't distract too much from the question that was posed. I'm not saying that as guy trying to defend Prohm, but 1) he's going to be our coach next year so talking about changing the head spot next year isn't really worth our time and 2) changes at the assistant level do have the potential to make a significant change in many of the problems we are seeing.
So back to the assistants the challenge with answering that question in a basketball program is it's not really clear what roles people play on the staff. On a football team the roles are more clear. If the offensive line is struggling it's easier to know (for a fan) where the changes likely need to be made. That is less clear on a basketball team.
As hard as it is for some here to admit there are things that coach Prohm is really good at. He can clearly recruit and he is consistently puts out a highly efficient offense. At the same time he clearly has weaknesses. His rotations are awful and his defenses are consistently bad. There are very few coaches that excel at teaching both offense and defense. The ones that you think are good at both, probably actually aren't, they are just good at utilizing their assistants. Shaking up the staff to compliment areas Prohm isn't as strong could have a really strong impact next season.
Personally I expect Prohm to be just as stubborn with his coaching staff as he is with his lineups so I doubt it happens.