A “frozen snapshot” of reliable knowledge is infinitely more valuable than a system which gives you wrong instructions and you have no idea what action will work or kill you. Anyone can “explain complex ideas in simple terms” if you don’t have to care about being correct.
What kind of scenario is this, even? We had such a calamity that we need to “reboot” society yet still have access to all the storage and compute power required to run LLMs? It sounds like a doomsday prepper fantasy for LLM fans.