You wouldn't necessarily need only 1/4 the drivers. The reduction in prices would increase demand for transportation by some amount. If that amount is less than

You wouldn't necessarily need only 1/4 the drivers. The reduction in prices would increase demand for transportation by some amount. If that amount is less than 4x, you would see an industry employment decrease, but if it was more than 4x, you would see it increase, just like how auto industry employment increased as cars were able to be made for cheaper and cheaper prices.