I'm not an RPh, but I do work on the business/customer service pharmacy operations side of a major PBM.
I work with pharmacists almost daily and can say that at least in my company, there is generally a strong demand for RPh's. *Especially* if they have additional skills in business, management, operations.
This isn't the only way to break-into/move up the ranks here, but the ideal degree in my opinion for our PBM at least would be an RPh/MBA or an RPh/MS in something business, operational or healthcare-related (e.g., MHA or perhaps an MPH if it was concentrated on healthcare management).
We have a handful of RPh's who have worked their way into management roles and most seem to lack significant business skills (with all due respect) and therefore they seem to be limited in their ability to move up in the company. A master degree of some sort is generally viewed upon as a rite of passage for most management positions in my company, unless you have some sort of significant experience as an RPh and are especially skilled.