You have your opinion, I have mine.
To address one thing though...If you think that couples all around the US are calling a taxi to go out for the evening or dinner, well in my opinion that is a VERY naive outlook. I would say the one's that live in very large cities with an ample amount of public transportation at reasonable prices may ver well; since a lot of those people in those cities don't own cars and use public transit, or cab's as a way of life.
The average couple in a city such as Sacramento with ridiculously high cab fares (approx $100-$110 for a ride form Roseville to Downtown) are NOT securing a cab, or a DD. That would be a date night, and assuming the guy drove, he has a couple drinks. he may technically be .08 and they drive to dinner and home. If you do not realize this happens almost every, every day you have blinders on to the way life "actually occurs" versus the you think an "ideal world" should function.