To avoid having too many cables, using the wifi of the GoPros sounds a good idea.
But we're pretty comfortable with the fact that it will not work well, for the following reasons:
- Activating the wifi heats more the GoPros.
- Wifi with the GoPros is to have a preview image, not a full resolution image. The video is compressed when sending over the Wifi, vs uncompressed with the HDMI.
- Having 6 wifi networks in the same environment requires 6 wifi USB keys.
- Wifi is much less reliable than HDMI.