Maybe...but Tesla also recently admitted they are struggling to lower their costs despite their giga battery factories. May never be able to supply their base model Model 3 for $US35,000 which would still retail here with freight and GST at over $N.Z60,000 even if they can make it for that price.
I agree that its difficult to predict the long term price of electric batteries but those manufactures as well as Tesla all singing a very similar tune doesn't auger well for your core contention of cheap electric cars within a decade.
Apparently 40% of the world's cobalt (an essential ingredient in car batteries) comes from the Congo.
You would hope they can recycle it with what's going on...https://www.dailymail.co.uk/news/art...ell-Earth.html