There's no way 7S can go away as soon as the end of the year. They have to shut down all the local spotbeams and there are only a few scheduled to go away at the moment. It will probably be around until at least next summer, if not longer. Directv 4S is already "de-orbited" (raised to a parking orbit) or at least Directv had scheduled for that process to begin on Sept 10th so I imagine it is complete by now.
Shutting down MHz Worldview has nothing to do with Galaxy 3C. That will go away whenever they have all the SD customers receiving the international packages upgraded. No idea what the status is, that might be done or it might be some time to go. Galaxy 3C will live on after Directv quits using it though, they only lease some transponders. Intelsat made filings for inclined operations to extend its lifetime to 2026. That'll work with its C band payload, not for Directv so they can't incline it until Directv no longer uses it...whenever that is.