re: Is it a mistake to concentrate industries and airport hubs into mega cities?

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I would agree with that if I didn't think that autonomous driving is going to be such a ridiculous game-changer with regards to public transportation

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Excellent point especially as it relates to local travel.

I still think that regional rail systems are important but I can certainly see how street cars and other subway type systems may not be as necessary for sunbelt or southern towns especially with the proliferation of ride share services.