Re: Touchscreen - you can, but do not have to use the touch screen. The settings can be accessed with traditional buttons too if one prefers those.
Re: Playback - the on-camera playback feature isn't enabled yet, but will be on a later firmware version. The cameras out there now are still using beta firmware.
Re: Using 30-40 cameras - multiple crews shooting multi-camera stereo scenes simultaneously + backup cameras for those... it all adds up quickly.
Re: Scarlet pricing - the latest estimated price announced by Red for ready to shoot Scarlet is still around 6000 bucks, not 10 000, thought it too might change for the worse of course.