Low hanging fruit, assuming you can afford to purchase a new car. Soooo, not so low hanging for a lot of people.
I think you'd have more of a point if most people were driving around subcompact beaters.
And remember the context was about someone who can already afford to fly regularly (potentially even overseas), in which case switching to an electric car--if they even require a car--is almost certainly feasible.
There are already fantastic options for EVs. Almost anyone who buys new could get one. At very least a nice plug in hybrid.