He is partly responsible but the main reason for the new limits has to do with John Lawrence Seigenthaler. In May 2005, an anonymous user created a Wikipedia article for Seigenthaler which contained a number of inaccurate statements as well as an allegation that Seigenthaler might have been involved in the assassinations of Robert and John Kennedy. When the article was brought to Seigenthaler's attention he wrote an article in USA Today criticizing Wikipedia. This opened the flood gates and lead to many complants concerning how Wikipedia works.
Was Adam Curry responsible for the current limits on Wikipedia?