But we all know the USAF as an institution doesn't like ground support in the first place ... tho the USAF pilots that fly such aircraft generally do.
The US Navy has some need for "battlefield introduction" and "deep strike" aircraft, thus are planning to keep the F-18E/F around to escort it's F-35C's as F-22s aren't carrier capable.
Tho frequently pressed into service for the above missions the USMC isn't all that interested in them, that sort of thing is the USAF/USNs job. The USMC is primarily interested in battefield close air support and operating from less then optimal airfields/carriers. I'm not convinced the replacement of F-18E/Fs in the USMC with F-35Cs is the best idea, but I never wore stars on my collar so maybe I'm missing something.