Two cases come to mind. The Mazda RX-8 and the 1999 Ford Mustang Cobra.
Both MFR's admitted to advertising more power than the cars actually produced. In both cases, the MFRs settled.
If Tesla plants their feet, it could backfire. Or it could be fine.
Successful Class Action law firms are almost political in nature. Step one is a marketing campaign to make the target into a villain. Once the general public knows that the defendant is inherently evil, the filing amount can skyrocket. Because taking it to court would be suicide if the defendant has to wear a devil's suit to the proceedings. So what was a $5m sting, can quickly climb to $50m by investing $1m in marketing and press releases.
But the $50m isn't the problem. The damage is done. You will always remember that Ford murdered thousands of people by deliberately putting the gas tank at risk. You won't remember that Ford deaths were not significantly higher than other brands at the time, because that was never the point. It wasn't about safety, it was about a big check for the law firm. They sent info (some say with a fat check) for an article to Mother Jones, and got the ball rolling. This had worked for lawyers with the Nader/Corvair case, so they just repeated a good strategy.
True body count from Ford Pinto tanks out of 2,200,000 cars? 27 to 180 depending whether the law firm had any credibility after the supposed Mother Jones payoff. Not different than other brand/model death rates with rear tanks per 100,000 cars.
Ford Pinto Fuel Tanks: Epic Auto Failures
Now back to Tesla. If a Class Action law firm sets it's sights on Tesla Motors, the publicity damage could be immense to a company who sells their products almost purely on reputation, not advertising.
I think it will blow over. Or I hope it blows over. The damage those cases cause becomes historic like crushing cars that nobody wanted to pay for. Damage far, far beyond any rational thought.