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The difference between an e-reader and a tablet is not nearly as clear cut as you seem to think. e.g. there are now a few general purpose Android e-ink tablets on the market, marketed on the basis of their extended battery life.
Many of the e-reader processors are theoretically USB OTG/Host capable, but what's usually missing are the circuits to detect that the host end of an OTG cable (or an OTG =>USB Host A socket adapter) is plugged in and then safely supply power to it. There also wont be any firmware or software support ....
This doesn't mean that it would be impossible to design a card reader for Kindles, but it would certainly need to be a dedicated unit that acted as a host and used the Kindle's USBnetwork device mode for data transfer to an app on the device. That's expensive to develop and is targeting a niche market so IMHO isn't very likely to happen.
OTOH there are pocket WiFi media servers, some with card readers available off the shelf, and getting one of them working with a Kindle is just a matter of client side software so there is no real need for a hardwired solution.
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