I wouldn't worry too much. Worst case scenario is Sony has to stop selling PS1 and PS2. Consider that this ruling is from an appeal of a decision that is at least two, maybe three years old. They are now appealing this decision. How long will that take, do you suppose? The injunction only applies to PS1 and PS2. PS3 is right around the corner. The worst this could do to Sony is prohibit them from selling PS2s for a few months prior to the release of the PS3. It would suck for them, but certainly would not be a deathblow by any stretch of the imagination.
Starting with PS3 I'd guess they will simply start paying Immersion the royalties that everyone else pays them or they will remove the offending technology from their controllers.
But if this appeal takes 2-3 years to be heard by the overworked appeals courts, just like the last one did, this will have virtually no affect on Sony's ability to sell any of their consoles in the United States even if the decision is upheld (as I expect it will be). Main thing for Sony is $90 down the drain, but they can weather that without batting an eye.