@tomc100, it was a while before 1080p came into the hands of the consumer in the form of camcorders, so it will just be a matter of time before
4k is as well. The biggest hurdle we have at the moment is storage.. 4k video content can fill a memory card 4x as fast as fast as 1080p, so most 4k cameras record on to super fast and super expensive SSDs to keep up. Consumer cameras will need to start supporting h.265 (or some similar codec) as well as faster and larger storage and a processor capable of encoding it in real time. Right now that is limited to professional and some prosumer cameras like the RED cameras, or the Blackmagic cameras.