I wished they have never included the video features but focus on improving image quality instead.
This is likely a false premise, and it has been well-hashed here. There is very little to suggest that including video has negative impact on stills (with one exception a few months back suggesting that there was a trade-off regarding speed at which the sensor is cleared, if I remember correctly). Also, any camera that can't do video these days is a niche product: it will not sell well, and so will be much more expensive, regardless of IQ or features.
Finally, consider that the D800 sensor everyone drools over also does video.
This idea probably doesn't hold any water: video is largely a software thing, and is essentially a free bonus.