I think the biggest gains will be in battery technology. They need to last longer. Also, a battery charger while driving would be a big help."Impossible" it certainly isn't, though to do it in continuous driving probably is. DC fast charging can easily put over a couple hundred miles worth of juice in the battry over a leisurely lunch. A lot of us have a road warrior mentality of putting the miles behind us when probably for both our health & safety we'd ought to take more break time.
Continuous gains in range, charge times, charger locations and reliability (there is that TX grid) along with modest human factor adjustments will soon enough put electric within most drivers' satisfaction range.