Not necessarily. We won't really know exactly what these systems will need to look like until the NHTSA releases their standard, but its possible that the standard will be satisfy-able while piggybacking off of already very common (and soon to be mandated) ADAS functionality like lane monitoring and automated emergency braking.

IF the standard goes that direction then automakers would probably need a little more compute but that's about it. If it mandates eye-tracking, breath or touch analysis, or anything like that then that will be a totally different can of worms.