Sadly jail time doesn't often come to those who do it (at least, from experience / hearing stories of intoxicated drivers) and the consequences are paid by those who aren't intoxicated (e.g: getting killed by a drunk driver).

It's definitely not a cure, but removing the human factor (aside from the intoxication part) is anyways a very good goal IMHO.

Oh and btw, I've seen also taxi / uber drivers that were under the influence of alcohol / cocaine. Humans are the problem.