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Air travel is often more fuel efficient than driving. 737s can get 100 passenger miles per gallon.
That said, I often wonder why people waste their time and money commuting when they can accomplish what they need from home.
I've been flying to Vegas about once per month for training over the last year. 95% of what I learned could have been done remotely, although I can see the importance of ensuring students are focused and not distracted by home things.
Efficiency will improve with time as the "sharing" economy and values continue to develop. For instance, fewer hotels will be built now that people rent under-utilized homes. Fewer cars are dedicated taxis now that any car owner can provide taxi service.
As society gets more comfortable with paying for things as a service rather than owning rarely utilized products, the need to build these products in quantity will decrease.
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