PHEV owners only need to charge at home (and if they can’t, don’t need a PHEV) and use electric power for local commuting.

The future of BEVs (and the most practical today) is also charging at home, and available chargers can grow slowly with BEVs used for road trips. Tesla is pretty close to there already. So, chargers don’t need to ubiquitous, just a bit more available on less common road trip routes.