The problem is that wikipedia editors are not creating new knowledge, they are just organizing it. A sort of wikipedia for research would be very valuable as a separate project, but papers are necessary because they enable a technical conversation. One or more authors present their particular view of a topic, and other researchers join the discussion by writing their own papers. On the other hand, a shared page is an amorphous piece of information that is very difficult to use as a discussion medium. In this sense, wiki articles are much more primitive than traditional research papers.