Aren't we as technologists always preaching the benefits of technological conservatism, minimalism and simplicity?
Our environment has obviously changed in such a way that it's now difficult to re-introduce equine transportation on a mass scale (where would you park them in a city designed for automobiles?), but we need to think long and hard about the world view that led us to conclude cars were universally superior to horses. I suspect the argument comes down to "productivity", and the axiomatic belief that it should be maximized in all circumstances.
I think your comment actually is wise.