CBDCs enable chain of custody in a way that isn’t possible today. Every CBDcuckbuck in the system can be tracked end-to-end and if they’re to block on/off ramps, then yeah it is likely that companies will reject any payments where that chain is questionable, likely automatically.
I’m not saying it won’t be at all possible but rather that Bitcoin becomes a parallel system in that case where it won’t be competing to pay for power bills but it’s addressable market will still be exponentially greater than today.