Let's built a future with 300mph self-driving supercars and mach 20 spaceplanes -- addressing the actual desires and wants of most users (mobility, convenience) rather than imposing personal ethics of asceticism (mass transit, anti-urbanization). The author brings up a lot of valid problems with contemporary car travel (and notably none of its revolutionary advantages), but most of these orthogonal to the personal-vs.-mass transport issue he argues, e.g.

* Health dangers from emissions -- an issue of (certain implementations of) internal combustion, not the form factor of the vehicle: personal auto vs. bus or train

* Health dangers/obnoxiousness of long commutes -- likewise, a complicated thing which doesn't immediately suggest "ban cars" as the obvious solution. (If anything -- everything else being the same -- self-driving supercars should result in the shortest commutes: point-to-point (last mile), no waiting, no traffic congestion (from AI)

* Infrastructure NIMBY (roads, sprawling parking lots): rail lines have the same issues, with the tradeoff that the sparser your mass transit ugliness is, the more excruciating inconvenience the last-mile segment of a commute is (try living 10m walk from a subway stop). Flying "cars" are almost certainly infinitely worse, because of their extreme noise

None of these are arguments against private transport; they are arguments against specific implementations of private transport, and don't at all imply the conclusions the author derives.