Even if the 1TB cards can be read by a given firmware/device, most users are still going to unknowingly use FAT32, which only supports files < 4GB. So, 4K will impractical on these cards (not that is wasn't already ridiculous, but...).
Book seller: "OK, but you'll have to sell your soul, the souls of every one of your friends, and the souls of every member of your family, including extended family members and future descendants. In return, we'll give you some DRM authorizations. We reserve the right to revoke these authorizations at any time, for any stupid reason, without giving everyone their souls back. We provide no guarantee that our DRM technologies will work on your device. Now that that's out of the way, let's discuss financial payments. How much is your home worth?"