People be like “but who will build the roads?”
Roads? Where we’re going we don’t need roads. 
Discussion
The actual answer is the same people who do now. The difference being that it's probably done better and cheaper without government involvement.
It’ll be interesting to see what happens to the roads when we get flying cars. Probably shantytowns like in Altered Carbon but hopefully not.
Pro tip: when someone says “but who will build the roads?”, a clever retort is “but who will build the cars?”, and then show them a picture of a Lada
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Bitcoin is the flux capacitor
A government will still build the roads but it's going to be a very efficient government run with Swiss democracy and referendums every 3 months on a national, regional and local level.