I watched a lot of Jeff's FB live today. He has zero *stated* interest in the amps and is slammed with the guitar side of things, so I sort of believe it. Down the road maybe, or of some of the more valued amp employees from Carvin Audio come over looking for work and are eventually allowed to invest time and money into more specialized amps.
Being in electronics (lighting) myself, what Carvin Audio is doing doesn't seem like a permanent bankruptcy/shutdown sort of thing. They're selling everything off and closing the doors on the manufacturing operation, but I suspect that they either already have things lined up to re-launch with outsourced manufacturing, or as you suggested, someone else is going to buy/license the name and continue in a different way - also likely outsourcing the manufacturing.
As for the guitars, Kiesel does own the rights to "Carvin Guitars" and will still put the Carvin name on any of the pre-existing models. They won't do it on new Kiesel specific designs, though, so the Carvin name isn't dying and Carvin branded guitars will continue to be made. I doubt anyone is going to find out the 100% full story of why the siblings split up the companies, but it does seem like Jeff specifically want to return to the original Kiesel name and to to create that differentiation between the companies, regardless of whether Carvin Audio succeeded or failed as a standalone entity.
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