It usually takes turnover to repair culture. Each new person gets the culture and vision from the leadership and sets a foundation for each person that comes afterward. Through attrition, the leader instills culture incrementally, until the majority of remaining people are bought in and sharing in the vision.
Very few companies or programs can change culture successfully with training, accountability and mere words. Millions of dollars are spent each year by companies investing in improving culture. It takes a leader who understands it takes time, is grounded in principles and remains steadfast in their pursuit. They must be able to sell their ideas, show results and earn credibility over time. Soon, the members of a team employ self accountability and require less coaching. Until, you can implement a long term plan for change, your culture is not going nowhere.
I've taken over departments and even companies with bad habits, low morale and poor culture. Coaching them up only gets you mediocre results and leads to frustration on both sides due to underlying philosophical differences.
Set expectations, hold people accountable and let time run its course. Eventually, you will surround yourself with those who believe.
What we have at IU is an undisciplined culture over the last 12-15 years. Arch seems like a guy who gets it. I've seen more discipline in the last year and half than in the previous 10 years. The disappointment and frustration he shows for our current state is a good sign. (Think about the Duke post game presser from last year) The media, fans etc all congratulated him for a hard fought close loss against the number one team. He was appalled at the notion and was having none of it and shut it down.
Now it just takes time and attrition so he can surround himself with others who buy what he is selling. Until then, we will have mixed results. Withholding judgment until at least midway through year 3 is not only fair, it's the responsible thing to do.