I can't imagine what future Sony plans will be....but I think the real bet will be in consumer and pro-sumer video-recorders.
If you remember what happened in the audio field , the first was Zoom and then Edirol, Tascam, Olympus, Sony, Marantz and many others came out with pocket handhelds in order to provide a better quality than minidisc ( or easier use then DAT) for musicians, tapers ecc.
Next step from these brands was adding more channel and/or xlr inputs in order to improve flexibility and pro-leve connections to their gear. Some of them (pcm m-10 and Edirol r09hr) had a convenient plus in a line-input accepting quite hot signals and thus allowing to be use either as a standalone piece or coupled with an external pre as an alternative to a single recorder equipped with xlr.
In video recording we are, IMHO, at the very first step with Zoom, Olympus and now Tascam. If you want a real professional video you need two or more different camcorders and separate audio, but we are very far from an easy-to-use setup.
Handheld video recorder I mentioned don't have a real better video quality than a good cell phone, they are horrible in low light conditions and, on the audio side, they have a line input which is pretty unusable due to a -10 or -6 nominal level.
I recently recorded this clip
http://www.youtube.com/watch?v=_lGgTitxHyY with a 250Euros or so Canon camcorder and separate audio on a Mac. It's not a professional video, I know, but its decent for a promotional clip.
If somebody will sell a product with a similar video quality and good sound ( like sony pcm-10 or similar) he will sell an enormous quantity!
Thus you could have either a decent video clip ready to be used or to mix with a video shooted from a second camcorder.
Is it asking too much?