The liability shift in the US that affected most retailers occurred in October 2015 -- basically, merchants are and have been liable for fraud that occurs on swiped transactions. I'd be curious to find out how the example presented by the parent article could change this -- a valid-looking card that only has swipe would definitely be taken by a merchant for fraud, and if the card doesn't claim to be EMV-capable, it seems like this would not be the merchant's fault. I would think in 2020, however, a mag stripe only card would raise red flags with humans at the counter, but gift cards are this way, so perhaps they would just breeze right through.