I don't think the problem lies in coaching. The desire and the intensity is missing from the players. During WC when Ian and Julian was there, India flattened us in the opening match and 58 and 78 followed. So it wasn't all great and amazing under their tenure. In fact, except the win against ENG, our WC was very poor and we almost lost to IRE.
Julien is coaching Pakistan now and I don't see any marked improvement in their fielding. Their fielding was very poor in the Semi Final and only Shoaib Malik fielded well. Ian was offered a contract by BCB but it fell off during the negotiations.
So we can't just stay in the past and keep yearning for Ian and Julien. They are good coaches but not irreplaceable. Yes, SJ and Swift has been very poor and should be replaced. Let's hope for new coaches and move forward.