Design starts with constraints. If you don't understand the constraints, a redesign is just a fantasy. Wikipedia is heavily constrained by one thing: the exist

Design starts with constraints. If you don't understand the constraints, a redesign is just a fantasy. Wikipedia is heavily constrained by one thing: the existing mediawiki markup. That presents a huge challenge to implementing this redesign. Large mediawiki installs become brittle because users have a natural tendency to use the markup for presentation, not structure. Combined with the in markup template mechanisms, the tendency is toward a tangle of interdependent markup. Wikipedia's community does far better than most in fighting this with policy and consistency, but it's still an issue. Implementing this redesign would require not just working with some of the more difficult parts of the mediawiki code base, but also a laborious effort to rewrite a sizable fraction (if not the majority) of all wiki foundation content. That just isn't going to happen. But that doesn't mean design improvements on wikipedia are impossible, just that any attempt needs to work in alignment with the constraining forces.