Not much. IA was avoiding the copyright laws that affected everyone else. They got away with it because they were so well known. The current law is bad and should be changed. If IA won, it would have been a huge boon for libraries and schools. But having lost only means everything stays the same.

IA can lend books that copyright holders haven't yet issued a takedown.

Hundreds of millions of dollars in punitive damages, resulting in bankruptcy. The IA shuts down immediately, their assets are auctioned, and soon fragments of their server racks appear in trophy cases in the lobbies of intellectual-property enforcement organisations.