Years ago, I listened to The Motley Fool radio show for a while. At first, it seemed interesting. Soon, though, I realized that they were full of s**t. They couldn't tell the back end of their alimentary canal from a hole in the ground. They tell you what stocks to buy, but if they really knew what stocks to buy they'd be too rich to spend their time publishing/broadcasting investment advice on public radio; they'd be flying private jets to exotic places where they'd be served fancy drinks by beautiful girls or boys. Their show isn't worth the time it takes to listen to it, and their newsletter isn't worth the bandwidth it takes to download it.
That said, competition from "the Big Boys" is a very real concern for a small company like Tesla. If the Big Boys decide to buy them out and Musk decides to let it go, so he can move on to something else, shareholders will get a nice pay-out, either in cash, or more likely, shares of the purchasing company. If Tesla merely loses to the competition, it could go bankrupt and shareholders could lose everything.
It's the risk of investing in a start-up company, and anybody who thinks that Tesla is a sure thing that cannot fail is living in fantasy land. It's the reason I'm very unlikely to ever buy more than my 100 feel-good shares. But I'm also not likely to get scared and sell them either, because I like the company and if the share price drops to five cents I won't lose enough that I'd miss a meal. Tesla is a small company facing real challenges and it could fail.
But on the other hand, Tesla has a great product and very savvy management who are committed to an ideal and determined to make it work. And if there are risks, there is also great potential. I believe Tesla will make it. As I said in another thread, I would not have bought my Roadster if I didn't believe the company would be around for the long term to service it. And I'd much rather support the company and its ideals by having fun driving my Roadster every day, than invest the same amount in their stock and hope that in ten years that hundred and twenty grand would turn into a million. And if the stock does go up tenfold or a hundredfold, I won't regret my decision because I'll have enjoyed this car for that decade, rather than just watching the stock ticker anxiously every day from now to then.
There are no sure things. But Tesla has a lot going for it. I express my confidence in Tesla by driving my Roadster. It's my daily driver, and it's the slickest car on the road. I think they'll succeed. But I sure would not invest my entire life savings in them, or even a large part of my portfolio. That's in much more stable investments than a start-up company with an uncertain future. TSLA is, IMO, a great place to put some of your risk capital. Not a great place to bet the bank.