The RIAA haven't won anything.
All it will take is for some smart coder to reverse engineer the main program and hey presto, it will be back online !
Seems that has already happened

Last month, the Gnutella-based file-sharing client LimeWire was effectively outlawed after a U.S. federal judge granted a request from the RIAA to shut the software down. Now, not even a month later, LimeWire is back as good as new. Not only has a secret dev team reanimated the hugely popular client, but they have also made a few significant changes which make it better and more streamlined than before.
Source Torrentfreak.