I really feel like the lack of well-structured citations is what's keeping many Wikipedia articles back. It's just not good enough to throw some paper reference (potentially behind a paywall) or a news article after a full paragraph of text.

Often when editing a page, I am left wondering where exactly the previous editor has gotten a fact from. The Wiki markup even allows "quotes", i.e. short extracts of what exactly you're referring to, but I've yet to see anyone beside myself actually use it consistently.

Having a structured list of references for a given topic in a Wikipedia article is incredibly helpful!