There would be no lawsuit. The only repercussion would be a court order to discontinue distribution, which would require EA to have lawyers file a complaint. Which they would not. Check PR.
That's pretty short-sighted especialy when you know how lawyers deal with copyright infringements in some countries, like here in Germany for example, people who make a living out of suing people for just doing the wrong step at the wrong time, even if it is not an infringment on purpose.
And this exactly is the problem, that Harmonikater explained. Distributing FH2 as a standalone using content and code from BF2 and redistributing this stuff is nothing else than ripping a cd with music and distributing it in the world wide web. Even without the copyright holder even taking care or knowing of the infringement, a certain group of people like picky lawyers will try to get you nailed down and earn some money. And they will not write a letter to roll back, they will send you a bill.
That's something that goes beyond some peoples horizon and sometimes it feels like talking to a group of five year old. Even if you explain it perfectly fine and with every information needed and some good reasoning, people will still insist on that FH2 devs are
a) totaly against horrible Standalone (wich is complete rubbish, as we all know of pros and cons)
b) too lazy or
c) just too scared.
Anyway, everything that needed to be said was marked in my last post.
@Dancho: porting FH2 as is (over 40 maps, all the equipment and stuff, looking though every object in the mod including sounds, textures and replacing them) to a new engine is such a huge amount of work that it is not a valuable option.