No, Wikipedia should move towards delitionist principles, because Wikipedia will only survive if they maintain their integrity. People need to believe that Wikipedia is credible, or they will not continue to use it. Wikipedia needs to make sure information is accurate, otherwise people will be happy temporarily, but they will not maintain their audience for long.
The fact that many users contribute to Wikipedia is good, however quality control is becoming an issue and a more stringent approach in terms of editing is required. If Wikipedia becomes a soup where anyone can throw in any ingredient they wish, where all viewpoints and opinions and topics are equally important and valid, then it will become a mishmash which is no more accurate or useful than the internet itself.