Technically speaking, the Camry outsold the Model 3. Camry sold 30K units in September vs. 22K from Tesla. What Tesla is though is the undisputed champion of all things EV. Not even close...they are the market. You can take all the other major EV players and combine them together and they still fall short out of Tesla (in the post Model 3 world). The interesting concept will be what will Telsa's go-forward run rate look like since they had a huge order book going into launch. Either way, while I question Tesla's long term ability to be a sustainable car manufacturer...I do not undersell the impact they will have on the auto industry.
Tesla, post Model 3 success, represents ~2% of the US marketplace. Prior to the Model 3, they represented roughly .3-.4% of the US marketplace. Additionally, electric vehicle sales represent barely much more than the Tesla market-share. What Tesla has accomplished is astonishing and if EV ultimately becomes fully mainstream, they will be the reason why (or at least a huge driver in why it emerged when it did, etc)...that said, the sheer mass production capabilities of the major auto manufacturers can quickly pivot as the scale/margins evolve. This is not to say that Tesla doesn't have a massive head start...it does...but it also has certain material limitations around production/distribution (including robust worldwide capabilities).
At some point Tesla will be acquired...but not for a long time as they are way way too expensive (valuations > than every other auto manufacturer on the planet). Instead companies will continue to reverse engineer and pour more and more into R&D as the EV marketplace continues to emerge.
We can look back in 10 years at this post and see how crazy wrong I am haha.