Additionally, without the constant presence of internal combustion engines our cities would become much calmer and more peaceful. I could enjoy urban spaces that are safer and more friendly to pedestrians and cyclists because the streets would be less congested and less dangerous.

If any day the ban is imposed though it seems to be a hypothetical thing to do if it is done someday a lot of human lives would be saved after that, because motor vehicle-related accidents leave 1.9 million people dead all over the world every year and these accidents would be avoided, people suffering from respiratory diseases would decrease in number so would be the burden on the health sector but a whole new lot of problems would get created like humans would face challenges in logistics sector, shipping, emergency services etc. Its most immediate impact would also be that it would render a lot of people jobless worsening the unemployment scenario at a global level.
Anyways, any such ban would definitely come up with some positives to the environment but at the same time, it would have a very bad impact on various other sectors and thus disrupt the balance that the world has achieved over the years.