Earlier quoted context omitted.
You don't need to ban telemarketing, you just need to make void and nulls contracts made by phone. Do so, and 99% of telemarketers no longer have the incentive to call anybody.
Walk me through an example here. I'm a telemarketer who calls you up, sells you on something, and charges your card. What changes in that scenario?
The long term effect may be that credit card companies stop supporting remote transactions that don't use biometrics+attestation or the physical card.