You just answered yourself. One small change could have been made, but i'm sure nothing would have happened because it would have effected the economy. Wait did I just bring that up... yes. If something is a negative effect on some sort of profit they won't do it.
Btw I haven't listed reasons due to the fact that sounding like a broken record is not me. You know them, people preach about them, but yet no one gives a damn. Its because we depend on these things so much that giving them up is out of the question. EG. cars with one driver (how about driving trucks when you don't need to)
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