Not all major car makers will fall into the "legacy/old and busted" category - I think the ones with a long-time reputation for quality/dependability will be able to make a strong splash in the EV market once they've got a comparable product.
For example, if Honda or Toyota makes any of their mainline models with the simplified/basic interior but just with a well-made EV drivetrain compatible with the Tesla charger network, I'm probably buying instantly.