Also, why is it a only triad? Where’s space in all of this? Wouldn’t paranoid sociopathic policy makers with their inflated USA military budgets have already considered the scenarios you’ve described and put multiple contingency plans into place? Just asking.
To offer an alternative, I’d speculate that between USA, Russia and China, all three have privately advanced their own technology to maintain deterrence for the foreseeable future. Just pure speculation of course, I’m not a government employee nor do I have any clearance or special info. Just seems improbable that the USA hadn’t planned for a superpower or alliance trying to disarm all of their nuclear arsenal at once.
Thanks.