It is already a mass market car. Model 3 is the best selling car in California for the second half of 2018. By best selling, I don't mean in the EV category, I mean above Civic, Accord, Camry, Corolla.
See https://cleantechnica.com/2019/02/23/tesla-model-3-was-top-s...
...and the price just dropped, so you can expect even more competitiveness than the data from 2H2018.