> I did ask on another chat board with a long thread about the UK and was told that the number of counterfeits was down since they introduced bard codes.
England and those Shakespearian bard codes.

90% reduction in counterfeits is what I heard.
I think they attacked the problem before it got too out of hand. The issues that UK had with the rollout and exchange process would be amplified greatly here because of the size of the US market, and the great flood of counterfeits since 2022 when UK launched the exchange process.
IMHO there are too many counterfeited stamps today (both in number of different issues, and total stamps in customer's possession) to reliably do an exchange of old Forever postage for new barcoded postage. Unless they cut their losses and bought out (exchanged) each customer's counterfeit postage at face value. Otherwise I predict too many false positives and false negatives in the validation process which would be a PR fiasco. No good solution, but the longer they wait, the worse it gets.