Without a doubt, if all motor vehicles were to disappear, animals would be the best option. In fact, today there are places that are difficult to access for a vehicle and certain animals such as horses or mules are used.
Human beings, despite their intelligence and development, need help and extra strength to transport loads and if vehicles disappear, we will undoubtedly return to that time where animals were the best means of transportation.

yes, I truly agree with your statement, but I don’t think that the usage of animals for transportation would last long because the level of technological intelligence and expertise, the humans have developed over a period of time will help humans to come up with an alternative with little effort, and within a short period of time.