Yeah, RSNs are a different game. Sports in general is in decline; the RSNs are likely included to fill out ESPN's content deals to build a national sports streaming service. Things like Big 10 network have enough restrictions that the content could not be rebroadcast on ESPN or separate services.
Slightly ironic that ESPN itself has significantly scaled back baseball coverage/studio shows this year, yet they now own RSNs who have rights for 16 (by my count) MLB teams