Battery tech jumps in phases. From where we are now, the next step will be a lighter, more power dense battery but that won’t be available in cars around scheme prices for a good few years yet. Even then, there will be a market for those unable to afford new cars but who are willing to pay less for one capable of 95% of the original range. Remember, high voltage warranties are 8 years, so even a fully extended EV at 5 years old has 3 years of fully covered use unless the car is approaching 100,000 miles.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark