A citadel would help with this danger, so long as you never wanted to leave it for the untamed outside world. But that seems pretty unlikely to me. On the other hand, I think the idea of normalizing the security measures and access practices described in that post is being severely overlooked in this (and the original) discussion.

Bitcoiners have converged on things like "not your keys, not your coins" and the importance of UTXO management and other bons mots of that sort; they could similarly campaign for practices that would prevent the reality I describe from taking place, but they'd have to think it through sufficiently first, and most seem unwilling or unable to.