I'm very excited by the prospect of aftermarket batteries with better technology. This doesn't get discussed super often, but as an owner of a gen 1 leaf with an aging battery, I've very excited by this.
To sum up the premise: volts are volts and watts are watts. So long as can get something with a comparable battery controller into the right size and shape and space, its basically arbitrary what technology is making the angry pixies go from - to +.
This opens the door for range improvements to much older EV's.