The Model ≡ will NOT be an econobox. It will not be front wheel drive. It will not compete directly with the LEAF or BOLT. Neither will it compete against the Corolla, Focus, Golf, Civic, Cruze, Sentra, Rio, or Elantra.
It is highly unlikely that Tesla Motors will even be able to build an econobox within the next ten years. The companies that build the world's most popular econoboxes all move nearly a million each of them worldwide, and have a capacity of around 10,000,000 cars overall. I think you are mistaking Generation III vehicles with a thus far unannounced Generation IV.