It worked some places for decades. I think crowded urban areas have every right to tightly regulate limo services. However out in the burbs it's another story. The only way to avoid drunk driving in the burbs for many years was to not drink, and that's a bridge too far for a lot of people. I have no idea if there are stats, but anecdotally, I can say that Uber/Lyft have stopped me from getting behind the wheel after drinking many times. In the old days, you'd have to call a cab, wait an hour, then hope someone else didn't just hop into your ride, because the cabby didn't give a fuck who he was picking up. The thing about Uber is that there's plenty of room for them to make money in a regulated environment. If they were smart, they'd work with the government to try to shape regs, rather than oppose any and all attempts at regulation.