That is true, but motors will get smaller, lighter and more powerful, just as IC engines did in the early 20th Century.
I predict the emergence of ultra-magnets that are very small, super strong and not made of rare earth metals.
Super Capacitors/Batteries will charge in minutes, not hours and since the electric cars will have much less parts and therefore less labor, they will be cheaper...........
I just read that Indycar is using supercaps in their new hybrid drivetrain from Mahle.
Super Capicitors have been 10 years away for 40 years. It might happen, but really hasn’t yet.