Here is an interesting essay by Paul Graham about the future of publishing, shared on twitter by Michael Nilsen. The main idea is that "economically, the print media are in the business of marking up paper", in other words they do not sell content, but gain money solely for production. This might be a problem in the era of online publishing.
Today is of no doubt that paper versions of scientific journals will not last for long time. The process has already started: the American Chemical Society has basically interrupted printing anything, except for JACS and two review journals. The New Journal of Physics has no paper version from the very beginning.