Eau Claire was both not well designed but also ahead of it's time.
The two big features were the farmer's market and the first IMAX theatre in the city. Unfortunately, this was back when an IMAX blockbuster meant a documentary about the jungle or something like that. It was around 15 years after the market opened that big movies like The Dark Knight had IMAX-filmed segments in them. And it's only become more popular since then -- these days even music videos are being filmed in IMAX. Similarly, the move towards farmer's market and local produce and so on is much bigger than it was in 1993. Unfortunately, retail has a really strong feedback effect; a good retail area attracts better retailers, which makes it more attractive. On the other hand, once people stop visiting retail, it goes into a death spiral; the more popular merchants move to better locations and less attractive retailers move in to take advantage of the cheap rent.
The other reason is the central city population has grown substantially since then; the census tract with the mall is up 45% or so since it opened, and the three next closest ones are up 35%. An extra 6000 people or so within walking distance would help the mall substantially. (The Civic Census 2016-2019 shows a further 8% or 2000 people in the communities that approximate these four tracts; Eau Claire and Chinatown are up around 20% vs 2019). And this doesn't include the massive growth in the Beltline, Bridgeland, etc. - I picked another 8 tracts bordering the four I show below; they went from 42K in 1991 to 54K in 2016 - 12K and 27% more.
But it was also badly designed -- both the big picture where it's surrounded by ample parking trying to complete with suburban malls, rather than surrounded by retail or residential building that density. Even at smaller scales, though -- the food court is at the north end, as far away from the downtown office lunch crowd as possible; meanwhile, the restaurants with patios are mostly located away from the pathway, where they might draw in passers by on a summer evening.
That said, I wonder if an Eau Claire that opened in 2008, showing the newest blockbusters and catering to 15,000 more area residents might have been successful even if it was built brick-for-brick the same. (maybe a less 1993 color scheme) The problem is that by then it already had the dead mall stigma on it.