I've been watching this play out for a couple of years. Sprint being led down an expensive and unneeded path, while not listening to their employees that have the needed experience and have proven track records. Watching execs being blinded by Accenture's fake business case was embarrassing. To date I would estimate that I've now seen of over $12M wasted as well putting Sprint on the hook for more unneeded future expenses.
FYI - most of the Accenture team....fresh out of school with no experience in this subject. We end up spending our time teaching them. Sad.