To add a meta perspective: CGL have said that there are no immediate plans for, or intention to revisit, the Home Clans.
To me, it seems their story was wrapped up in the Wars of Reaving and they’ve been placed in something of a narrative stasis: Not entirely wiped out, but weakened to the point where they aren’t relevant to the story anymore. They can be reactivated in the future if need be, and will then have at least a century of recent history that is a blank slate. This allows them to be shaped into basically anything, and marks them a potential general purpose deus ex machina plot device stored away on the sidelines.
Currently, and for the forseeable future, the fiction is focused on the ilClan and the Inner Sphere, and has largely lost interest in the deep periphery affairs.