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If they fully embraced Chaumian e-cash, this could be great. I would support CBDCs then (as a stepping stone to Bitcoin). But I see no evidence of the ECB having any respect for privacy in this process.
Chaumian e-cash can work if the sender is offline. If the receiver wants to avoid a double-spend, the reciever should be online. But if they trust each other, it can be fully offline.