I think it already delights users. Wikipedia is so absolutely content and hyperlink driven that it hardly needs much else. It's immense popularity and ubiquity is proof of that. I draw my delight not from some invasive graphics and UI work, but from the fact that when I want to read about Pyramids, I click a link on Google to Pyramids (or on the Wikipedia front page) and ALL I SEE IS PYRAMIDS. No other UI, no other stuff to interfere with what I'm trying to do. And from there, I click hyperlinks and quickly jump from Pyramids to Ancient Engineering to Trigonometry to the various mathematicians who have improved on the work the Egyptians did.

The delight is in the speed at which I can quickly explore and consume human knowledge. Nothing I've seen in terms of graphical suggestions would improve that - only distract or prevent my friends in other countries from being able to use it properly.

To me, Wikipedia is embodiment of "less is more", which supposedly all of these hotshot designers are supposed to subscribe to, but apparently mistranslate it to "a metric butt-load of negative space".