Plus increased commute times by car and increased use of cars rather than walking everywhere.
I was going to mention that as a major factor in France as well. There are all sorts of follow-on effects. You now don't work in the village, but in the city. So you buy your groceries and such on the way home. The you go for a drink with the mates before going home (but just one drink, because now you have to drive). So in rural France, not only does that put pressure on cafes, it also made it possible for a priest to serve multiple parishes. So the village Lawrence Wylie studied ended up with a "commuter" priest who would do the 8am mass in one village, the 10am mass in another, and then go back to his home in the city.
>>smoking laws
I wonder about this. In the 1980s, I remember telling people that I would not go to the cafes in Madison, Wisconsin, because they were all so smokey. I said they could get a lot of business by banning smoking. Everyone told me I was stupid. People want a coffee and a smoke. I moved to Switzerland and then came back to find every single downtown cafe had banned smoking.
What happened? The owner remodelled Sunprint cafe. When she did, she was shocked to see the years of accumulated smoke on the ceiling and that the art on the walls had actually been ruined. So she banned smoking. Suddenly, all the non-smoking coffee drinkers abandoned Steep and Brew and the other cafes. It was impossible to get a spot at Sunprint. Within six months, all the other cafes had gone non-smoking because their business had collapsed. And personally, I started going to cafes again.