California DUI penalties: Are tougher laws the answer?

There's no doubt that repeat drunk driving is a problem everywhere, and nowhere more so than in California. The story quoted below talks about some remarkable people who have many DUI convictions.

It's hard to argue that if somebody didn't learn their lesson after a second or third DUI, that they eventually will. The fact is, most of them will continue to drive drunk until they either kill themselves or somebody else, or die of something else.

Roadshow: Toughen California's DUI laws – San Jose Mercury News: “Under California law, a first-time DUI conviction brings a four-month license suspension, a second conviction within 10 years means a one-year suspension and additional convictions within 10 years result in suspensions of up to five years.

Some prosecutors say tougher laws may not be effective, as drunks may continue to drive without a license.”

It's interesting that some California prosecutors say that increasing the California DUI penalties may not be effective. I agree, but the question is, what will be effective?