But these same companies are already issuing 100% chip-and-pin (plus tap) cards in every market other than the US.
If you want to blame anyone, blame the vendors of US ATMs and POS systems. Without their support, and a willingness to push through a deprecation/replacement of older hardware, chip-and-pin cards are pointless, because nothing reads them. (I would know, as a Canadian with a chip—and-pin card who frequently visits the US.)