The problem s the basis of the lawsuit, whether in Paramount's mind, or in the court's opinion. Paramount would need to feel infringed upon to even undertake such a drastic action. And the court could just throw the lawsuit out if it is without any merit. So far as I can recall, there are little things that Star Wars had in the dialogue that may have been a term Star Trek used. However, they would just point to Buck Rogers and Flash Gordon and say that Paramount's claims are baseless because those tropes and concepts predated them in previous science fiction and science fiction as a whole. Honestly, if you wanna have a better scenario here, don't do Paramount suing Fox/Lucasfilm. Because they did not nor would they. Do the estates of the creators of Flash Gordon or Buck Rogers suing them.