True, but if Worldwide end up paying/losing, that means less money paid back to the corporation, therefore a lower budget for other productions (effectively the same thing).
I'm a fan of electric cars, but I am disappointed by Tesla on this... using the legal system like this leaves a bad taste.
As Top Gear is a big winner for BBC Worldwide (commercial, not-license fee funded), it's been frequently the case in the past that they will fund any legal action should that become necessary.