CF cards should be available well after cameras that use them are discontinued. Given that both Nikon and Canon are continuing to make cameras that use CF cards, there should be no rush, unless you need them now. The fastest CF cards out perform the fastest SD cards. XQD cards out perform CF cards. So far, the D4 is the only camera that uses XQD cards. It has 1 CF slot and 1 XQD slot. We will see what the next generation of bodies will use in the next year or so.