Why is commercial aviation as a form of transport a useful goal? There are alternatives that have realistic energy efficiencies and use available technologies, like rail and nuclear shipping.
I agree we should do more trains, but they are limited to around 1500km per trip before flying is enough better that you look like a fool for suggesting it.
I'm not convinced trains are more efficient than planes at that distance either - I don't' know how to analyses it, but planes see much less wind resistance because of altitude.
the problem is that rail is "boring" and rarely get sufficient funding.
It's wired vs wireless ethernet. Which do you have in your home?
Then other things become more important, and drive choices.