Interesting point re increasing costs for other companies, seems like it could certainly happen and maybe even lead to an arms race of employer consolidation. This phenomenon has happened in the hospital-insurance area, where a big hospital will buy up smaller providers and negotiate higher rates from insurers. The insurers then either have to consolidate and grow themselves or decrease rates to smaller providers, thus incentivizing smaller providers to join the big ones.
This is a vicious cycle and I believe one of the main reasons for higher cost healthcare in the US. that said, healthcare is very local, so not sure if this new effort will impact local payer provider dynamics as much as it will increase more national scale issues like PBM and purchasing