I wouldn't think so, but you never know. The Sony A7s which is intended for video and low light has relatively fat pixels. The main advantage of fat pixels is that they allow for somewhat higher ISOs, the main disadvantage is that they are very prone to aliasing.
If we look at the P45 that has 6.8 micron pixels it needs to be stopped down to f/16 to by and large eliminate colour aliasing. With 9 micron pixels we would need to stop down to f/22, while with 5.2 microns we would see little aliasing at f/11. Both the new CMOS 50 MP and the IQ-280 are at 5.2 microns.
I would argue that a 5.2 micron image downscaled to say 39 MP will always be superior to a 6.8 micron image yielding 39 MP naturally.
Also, keep in mind that the only cases we look at pixels without resizing are:
- Looking at an image at actual pixels, known as pixel peeping
- Printing an image at native printer resolution, ignoring size, and looking at that picture at 25 cm range.
With video, resolution is limited to 2 MP (high definition) or 8 MP (4K), so it may be advantageus to use large pixels with heavy OLP filtering. Even better is to use small pixels, without pixel and line skipping and downscale in image processing, but that takes a lot of CPU-power. But, that is the way to do sharp and unaliased video.