Genie Tyburski of The Virtual Chase has written an article that asks "Can we throw away the books yet?" Her answer is a qualified "No".
I recommend you read this whole thoughtful article to see why.
Genie is a professional legal researcher who has worked in law libraries for more than 20 years. She writes for trade journals and newsletters, including Law Office Computing, Law Practice Magazine and The CyberSkeptic's Guide to Internet Research and she is editor of Introduction to Online Legal, Regulatory & Intellectual Property Research.