Even with phones, the real competition for the iPhone didn't come from the phone leaders of the day: Nokia, Motorola, Ericsson. Only Blackberry sort of survived. It is now companies like Samsung that compete. It may be similar for the automotive world - the real competition will not come from the current leaders.
As for TSLA's current value, all the talk about 2025's production and Tesla Energy eventually being bigger than automotive, etc. is all true. But, Wall St. doesn't keep that long a view on stock valuations. 20 some odd years ago, a fellow named Henry Boldget put what were then astronomical price targets on AMZN, correcting predicting they were going to own eCommerce. Amazon promptly rose to those prices right away, even though Blodget said that was years away. Those prices didn't last, and it took a decade before AMZN recovered to its previous level:
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So, I have caution that while I strongly believe in Tesla's long term value, I have grave concerns that the market in which stocks are valued will eventually realize that the long term potential is indeed years away, and reduce the price they're willing to pay accordingly. Are you willing to wait potentially a decade for the market to re-recognize the future potential?