I understand what copyright is intended to do, but I see little evidence that a 90+ year term and other onerous terms are means to this goal. Patents give us a good example of actual stuff being created with 1/4 the term - it's hard to imagine that artists would significantly change their motivation given a 15, 50, or 90 year window. It's very hard to argue that a law which prevents you from building upon another creative work for an entire human lifetime is advancing the useful arts. Rather, it seems like an abuse of government power by an elite.
And of course, as Google points out, the search index could not have occurred under such a regime. I shouldn't have to sell you on the usefulness of internet search on society vs the promise of more Rihanna songs or Transformer movies.