I don't anticipate that US card issuers will want to encourage use of PINs for domestic credit card transactions because they have created a huge revenue distinction between signature and PIN based authentication. US banks encourage customers to use debit cards with a signature rather than with a PIN because they earn far less on PIN transactions. If banks begin to offer PIN based credit card transactions the large national merchants will want to renegotiate their card acceptance agreements to reflect a similar discount.

Chip and Signature allows Chase to offer a large degree of international compatibility, without the risk of losing enormous domestic revenue.