Who will build the roads?
Honestly why do we care? What if no one build any roads and then suddenly we were left with only trails in the woods? Isn't that a much more adventurous and poetic life that...
If they end up with trails, and we end up with flying cars, I wonder how much they'll complain about how bad we are for using evil technology or something like that, vs. how much they'll complain about how bad we are for not sharing.