As long as the breathalyzer is only required once to start the car. I drove a car with an interlock one time and it required you to blow into the thing randomly while driving. Failure to do this correctly fast enough caused the engine to die. I felt more impaired driving under that system than I would have after 2 beers.
You got downvoted, but I agree with your comment. I disagree with the reasoning of "if you let kids drink, they'll definitely drive afterwards!", but I agree with stronger drunk driving enforcement.
Self driving cars should probably fix this someday. All other cars should have mandatory ignition interlocks for breathalyzing.
Someone should invent an bluetooth-connected breathalyzer which at least annoyingly beeps when you drive until you pass. It worked for seatbelts! Kids used to not wear then until the beeping made it more annoying to not do it. Annoyance is a big motivator.