Well, no, it's not a great opportunity for every local library to do this. As you suggested, they really don't have anything remotely like the staff and infrast

Well, no, it's not a great opportunity for every local library to do this. As you suggested, they really don't have anything remotely like the staff and infrastructure. But it shouldn't be a job for every local library. All that is needed is one copy of the book; not every copy of the book. And for more recent books, there shouldn't even be a need to scan it; there should already be a digital version (whether if it was made publicly available or not). Granted, long-term storage and viewing of digital files seems like an open-ended problem in itself, regardless of who is handling it. But so is long-term storage and viewing of physical books. The books take up space, must be handled with care, and will deteriorate eventually (though hopefully slowly as preservation methods have advanced).