I don't think I understand what you're trying to argue here; if you can't find a usable registrar for your domain… you can't really use that domain anyway, can you? They can just break it. But… let's not get into yet another DNSSEC/DANE discussion.

I'm not sure I see what this has to do with how the DNS operates, beyond observing that key rollovers are not a reasonable response to incidents like this.