Who are "they"? Anyway I can think of two parties: short sellers, who actively bet on Tesla shares losing value - and who are very likely behind all the negative press about Tesla, including making sure every accident a Tesla ends up in (especially if it's down to autopilot or involves fire or a death) stays in the news for weeks if possible.

The other would be competing car makers, who only now are starting to realize that electric cars are the future, except they're 5-10 years behind Tesla. I'm sure they'll catch up soon enough, given how they're much better at mass production than Tesla is atm, but they're way behind. Tesla will probably pivot to focus on their other endeavours - batteries (building the largest battery factory in the world), charging stations (building the largest charging station network in the world), green energy (solar panels and large scale battery storage), etc.