I'm a huge fan of Elon Musk. That said, if you think that Tesla is a source of trouble for traditional manufacturers then I think that goes against every bit of wisdom out there at the moment.
Tesla is interesting, a pioneer, much like Elons other ventures. But it is not a threat by any stretch of the imagination to established car manufacturers. Think of it as a large scale testbed, technology to be licensed when proven over the longer term, just like what happened to every other technology in the car industry.
Don't forget that the era of the electric car already came and went once before, it definitely looks like it is here to stay but it will be a long time before Tesla will be named as a viable contender to Toyota, VW, MB, BMW, Ford or even GM. This is not virgin territory, the cards have been dealt, customers have to be won from other suppliers and brand loyalty counts for quite a bit.
By the numbers Tesla is still a very small player, and likely to remain small for quite a while.
Electric car came and went because the oil industry bought up the technology. I imagine this scared many investors away from investing time and energy into it, and I imagine this drove many people into research and wanting to develop technology that would not be for sale to oil giants.
Tesla is already compared to BMW, and even as a better option. You should look into / watch some videos on Tesla as from what your saying seems like your knowledge on them is limited; Not saying this as a put-down, I've just kept up with Tesla a lot.
Do you know about their Supercharger stations, etc? And Tesla is building a very strong brand, beautiful product, etc.. Tesla's growing at exactly the speed they're wanting to, demand for their product is higher than supply. They're getting everything prepared, testing the processes, and I imagine will ramp up in a big way once it makes sense.