Could be all wrong on this but once programmable money exists I don’t think the debt will matter. It gives the powers-that-be granular control over what can be purchased, or not. Total control of the money also removes the ability of the populace to express their dissatisfaction with whatever draconian measures get implemented. No train travel for wrongthink, etc.
I acknowledge there is a lot of hypothetical in there, so really it just an expression of unease about what CBDCs could mean. However, it does make me realise how much of a long way there is to go (probably many years, realistically) in terms of getting people to “see the light” and accept CBDCs. I would like to think that this may never happen, especially if there is an alternative.