A conversion is not inexpensive nor easy. I know I have done two of them. Currently a quality conversion will run $25K. And you need the donor car. That will give one a 100 mile range and a reasonable 7 sec 0-60. I am also including heat and air. Yes it can be done cheaper if you want 50 miles range and 12 sec 0-60. With a Leaf running $26k with the rebate it will be very hard to compete. That is the reason I am now driving a Roadster.
...In 10 years if a car like the Leaf is even cheaper, I'd rather get than than take a 10 year old car for an aftermarket conversion to electric.
I qualified all this.
700 mile batteries, that means it will be cheaper than today and the conversion will go 300 (not 40 or 50 miles).. There will be serious kits for makes and shops that specialize ( a world of Gadgets) . I'm talking Classic cars (58 Corvette, Ferrari Dino, NSX) and Vintage, (Cord, Tucker), and favorites, Miata, Mini, and Bugs, I am not suggesting people will be converting blah everyday K cars Celicas, or Oldsmobiles. those ICE will be rendered obsolete by EVs.