Or congress will carve out an exception say that copyright doesn't apply to books when used in search, and that search engines and archives can display X amount

Or congress will carve out an exception say that copyright doesn't apply to books when used in search, and that search engines and archives can display X amount of the work per search, and an official orphaned works list can be maintained by the LOC and when a work is orphaned it enters the public domain. Copyright, and IP in general, is a farce and full of weird exceptions and rules.