More likely would be 100kwh battery packs, giving you a nominal hwy range of 400 miles.. I just dont see people paying for more (or wanting anything heavier) than that in a car.. a handful of fed or state owned 50kw chargers sprinkled across the hwy network would be sufficient for the yearly vacation trip to go see grandma. A 50kw charger recharges at a rate of 200 miles per hour of charge time... pretty substantial.
A different application will be large packs for long distance 18 wheelers, and they will come.. and 500 mile packs are about all you need for those also. Commercial aviation may also need large packs.