I have a strong opinion in this case that if anybody is to blame it is the players. With tons of experience, why is it they there were not able to deliver in batting / fielding / bowling?!!! The coach gives them ideas on how to play under different circumstances, but, like all forms of sport, the greatness of a person is always when he performs under all circumstances. We credit Tendulkar for his brilliant batting; at no point of time do we credit the coach for this. The same is for Pathan's bowling - when he was going great guns, he was the star - endorsements, advertisements, flowed in. The focus shifted. Similarly, Dhoni / Yuvraj have all lost focus in their games. The present generation feels that as long as we score one century a season and couple of mediocre scores - get an average of about 40, its fine.
It is good that endorsements and affiliations are being critically looked at nowadays. It should not degenerate into a situation that the top people share the money and the sport be damned.