Well if they do that it's not going to be targeted at video as such, it will be slanted as the ultimate tool for the dreaded "spray & pray" stills shooter. So if they forget mechanical shutter and just go with an electronic shutter, they can get the frame rate up to 30fps and stream frames out to the faster storage cards available in that era. This will be "video" but it will likely have poor DR, poor low-light, poor compression, and/or poor rolling shutter performance, as they are having to read from nearly all of a 36 megapixel sensor continuously.
But fair enough some people may actually enjoy trying to work with 8K video files for motion. I don't think that will be practical quite as soon as 2016 but by the end of the decade sure.
I am generally against continuous drive for stills shooting outside of fast action shots. It is not photography to me. Photography is about recognizing the right time to release the shutter by looking through the viewfinder. Spray & pray detaches you from the moment (and on optical VFs blocks your view of the subject). I will not be shooting 8K video for stills and I doubt I would for motion. The GH4 has barely 1080p resolution in its 4K mode as it is, their rendition of "consumer 8K" will probably have less than 2000lph.Rumours credibility responsibility of the respective rumour websites.
Don't think so. Think photography is about telling a story or showcasing beauty. Does not matter how.