Problem being, you may do more long term damage to the brand than what a settlement would cost.
I believe the brand will be largely unaffected.
Unlike buying [Firestone] tires, which are essentially interchangeable parts that we can mix and match as we see fit, the purchase of a car is a major action for most people that is very carefully considered and heavily dependent on price and on subjective measures like comfort and style.
Moreover, we all know there are myriad risks when getting into any car, not the least of which is the possibility of mechanical failure for any number of reasons. And we count on the manufacturers to act in good faith and alert us when problems are identified and offer recalls/repairs when fixes become available -- which Crysler did.
Yelchin's death is a sad and unfortunate accident, and his celebrity is magnifying the situation slightly, but ultimately the company acted in accordance with its obligations, and the market will recognize that.