The laws are already in place to convince (most) people against impaired driving. The threat of losing your license and being fined is already there. Increase the punishment along with naming and shaming the criminals publicly. Imprison second time offenders as they clearly have a drinking or substance problem that needs treatment and they can't be trusted to operate motor vehicles.
This is just a slow creep towards total governmental and manufacturer control of vehicles under the guise of ~safety~. I hope I can still buy offline vehicles for a bargain well into my life but with society and the law pushing people towards electric vehicles, I feel like that window is slowly closing because electric vehicles are even more guilty of this.
I hope the government will force these companies to release the algorithms used to determine whether someone is driving impaired so the public and other auto companies can work together to improve reliability of systems and also help up-and-coming automakers to implement these systems without another expensive barrier to entry to get past.
But they won't - and we'll be stuck with sub-par programming that doesn't account for edge cases, dirty sensors, broken cameras, electrical problems, and requiring expensive first-party repairs at your "authorized (st)ealership" whenever a part of the system has a slight problem.
Owning things is getting more and more expensive - no need to tack on more governmentally forced features that would really only prevent the die-hard drinkers and drug users from driving when they should be locked up in the first place.