Of course the first production ready planes will cost more due to needing to recover R&D costs, but in the end it will be so much cheaper to produce and safer as electric motors are so much simpler and can be so much more powerfull, and certainly with solid state batteries it is soooo much safer and one could easily have a simple changeable battery system where a plane lands, just replaces the large battery with a charged one and move on. They already have 30 seat passenger planes in development.
And as you can read, the currently used SS battery already had 60% more energy as the one used previously, and they expect the next to even have 40% more, and solid state batteries are still only at the beginning of their development, so the amount of energy will increase even more.
It might not be good enough for an intercontinental flight, but it sure will be more than enough for intercity/interstate flight. Also hybrids are also in development.
And 4 person vehicles will be replaced with VOTL versions anyway as they are much more practical as they don't need ling runways. (And VOTLs are already shown by many companies).