Big real estate killed malls. They aren't as efficient at generating rent due to their maintenance and upkeep costs, so real estate holdings firms are hell bent on liquidating them, subdividing them, and redeveloping the land piecemeal in ways that better optimize for fine access control and not having to take care of any "dead" non-money-making spaces such as the concourses between the stores. Instead: just parking lots between store fronts.

Now there's a Walmart, a Home Depot, an Applebee's, a mattress store, a liquor store, and maybe a transient party supply store that will occasionally occupy a space on a seasonal basis. When a slot isn't occupied by a tenant, they get to shut off the power, water, and climate control completely, and not have to end up wasting electricity or fuel conditioning the air of a space no one goes to right then.

If you WANTED to make a mall work, you could, especially if you added faux "residential" space (actually retail space where the product being sold is storage and privacy, with "sleep" being "against the rules" but they built it to intentionally not know that that's what the "customers" are doing there). Residential malls would guarantee a constant customer and worker base as people come and go to visit family and friends and end up shopping along the way.

But they don't want that.

They want to sell a MINIMUM viable product, and charge maximally for it.