WDDD lawsuit, the very first thing they are asking for as a remedy is "An order finding that the '690 Patent is valid and enforceable".
That would pretty much seal the game for them, and make it very hard to overturn the patent on any grounds. Once they've got that, they can sue just about every other MMOG maker and win in nice short court cases - or simply go to the settlement table and name their price to allow the MMOG to keep going.