An interesting subject. A new topic.
Consider a range of use cases. At one end is the vast majority of driving, which is near home and can be served by home or workplace or curbside or parking garage charging at a fairly low rate and cost. At the other end is driving to remote locations where charging is rare and/or expensive.
Might a PHEV be the lowest cost way to handle the latter cases?
Yes, might not be a gasoline hybrid, but perhaps biofuel or hydrogen or aluminum-air or zinc-air or ...
Putting power wires into remote locations cost a lot of money. The more miles, the more money. And as the location becomes more remote, the fewer uses the wires get as fewer people would drive to there. Other ways of getting power there have similar objections, such as solar cells that are rarely used have a high fixed cost relative to the actual used power generated. Hauling gasoline or biofuel or aluminum-air batteries or hydrogen has the advantage of scaling with use rather than a high fixed cost. Also a primary battery using air is going to have more energy per unit mass as the air doesn't need to be carried along (on Earth, at least!), so fueling stations can be more widely spaced.