The Volt and C-Max (and similar plug-in hybrids) are the answer to the transition problem.
You can drive them for your daily 40 mile commute on battery, then switch over to gas for your 1500 mile vacation.
It's not a long term solution, since having a gas generator and electric motor means extra maintenance in the long term. The long term solution will be fast charging for electric. These cars are the bridge between the existing gas infrastructure and the new electric infrastructure.