Now that multi-megapixel digital cameras now cost less than £100, the stills market is evolving. Soon, the number of pixels in the detector will matter less, it’ll be the quality of the technology getting the light to the chip which will matter more.
I suppose once we get to 8K for moving footage, there’ll be no point in increasing resolution. Engineers will be more interested in stereoscopic images and higher frame rates, or possibly variable frame rates within the same movie.
Will 8192 by 6224 be enough for you?