I have four questions about the post-Reaving Clan Homeworlds:
1. Are the Homeworld Clans neutralized as a threat to the Inner Sphere forever? I mean there are only four left.
2. In addition to Stone Lion, do you see new Clans raised in the future?
3. Do you see the current Homeworld Clans expanding beyond the Homeworlds?
4. How will the Homeworld Clans react to the ilClan?
Sadly the Home Clans have been put on a bus and answering these questions isn't financially viable as most of the BT community just doesn't seem interested enough.
With that said, some thoughts of mine below:
1. To the whole IS? Almost certainly. To any given part of it? No, if the four Clans worked together they should be able to carve out a new OZ, from the LC, DC, or crushing the Hell's Horses entirely.
2. Potentially, if the Home Clans grow big enough to merit it. There could be a split along Bastion/Aggressor lines in Clan Star Adder for instance. Or former Clans like Fire Mandrill or Steel Viper could be resurrected as 'purified' versions using the right bloodlines.
3. Very likely. The Imperio and Hanseatic League are obvious targets. By conquering them the Aggressors would get the combat they crave, and the resources of 9 + 29 systems (with presumably less hostile planets) would fall under Clan management.
4. What Rebs said. Wouldn't surprise me if Clan Sea Fox in fact maintained back channel comms with the Adders, providing them with intel on current affairs.