Peer-to-peer file-sharing on the Internet has certainly weakened copyright, but that's not necessarily a bad thing unless one equates "stronger copyright" with "better copyright." According to the US Constitution, copyright is about promoting "the Progress of Science and useful Arts"; it's not about enriching authors, except as a means of promoting said "Progress."
When we think about copyright, the most pertinent question to ask is not whether some change would produce less money for rightsholders, but whether some change would remove incentives to create. Has file-sharing reduced creators' incentives?
via arstechnica.com
Thought-provoking article - well worth reading.