Argubly, there are still economies that rely on horses. Havasupai still gets all their mail by mule, in the USA. Its a matter of scale. There will always be use

Argubly, there are still economies that rely on horses. Havasupai still gets all their mail by mule, in the USA. Its a matter of scale. There will always be use cases for electric, ICE, and even beasts of burden.