Tesla's new tabless 'Roadrunner' in-house cell with 1 million mile / 4000 charge cycle capacity will be the final solution to permanently shift cost economics from petrol cars to EVs. 'Battery Day' may go down as one of the most seminal moments in automotive & industrial history. 
If this new cell is made available to only Model S/X, I think they might actually reclaim the value proposition versus 3/Y as it would end up costing less over a 30-yr macrocycle because of its 100-200% greater battery longevity.
It would also be insane to buy any gas car priced above $35k, as it'll bear (-) NPV after considering petrol costs, maint, depreciation, and the fact that you'd burn through 3-4 gas cars during the useful lifespan of a single Roadrunner-powered Tesla Model S.
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