Tesla’s plan for affordable cars takes page from Detroit rivals

Elon Musk’s new plan to use current product lines as the basis for new affordable vehicles – rather than springing for all-new models – follows the playbook of Tesla’s old-school Detroit rivals, as some Tesla investors and analysts see it.
The shift toward incremental improvement, mirroring a common strategy of Ford and General Motors, suggests the future of car-making that Musk has promised to disrupt may still look a lot like the past.