They're also right about hydrogen fuel cells. They're stupid. Maybe if we get into space and can get an abundance of hydrogen things will be great. But, here on Earth you have to manufacture the hydrogen and create a vast infrastructure to transport and store it.
Tesla also have a big lead in the use of telemetry and their ability to do software updates over the air and their approach to security and building this in-house. Other car manufacturers will continue to outsource this and continue to fuck up completely.
However, Tesla had to follow through with all of this, maybe be out of the public eye for a while and iterate over the engineering, keeping costs to a minimum and doing the R and D, before moving on to other capitally expensive projects. They've massively overstretched and I don't see it being recoverable.
But.....the grand visions before the boring grunt work of engineering has been accomplished, and trying to build massive $5 billion factories before any kind of profitability is on the horizon is not going to help Tesla stick around beyond a few years at most.