What I am curious about is while yes the shock happened across all cloud storage systems, however if this falls through and no actual "legal precedent" is set I'm sure the shock will wear off eventually. Also it might give the image of ya you might be able to seize servers in the US so I'll just keep them out of the US and make a MegaUpload 2.0 in a "safer" country and now you can't touch me altogether. All you can do is go to the end of your rope (jurisdiction) and bark.
I did consider that, but there is also the fact that the megaupload servers were not in the US. Although the people and companies in question cannot be legally tried, there is nothing stopping the FBI from pulling this kind of stunt again. The companies in the USA get their pet government agencies to exert political pressure on other countries and all of a sudden you have a large join operation that arrests people all over the world seizing all their assets and generally making their life hell. Sure, nothing will happen legally, but having your life turned completely upside down and having everything you own just randomly taken away is a pretty noticeable problem when it comes to trying to start up again.
The megaupload stunt is similar to the Wikileaks stunt the US pulled. They can and will pull these things again, and it does have real consequences for the cloud server companies. That said, they still wont stop piracy. Piracy has been around since before dial-up modems it will continue. However with stunt like this those companies manage to get their impotent revenge.