I can't imagine what "experience" we all thought we were enjoying in these grayboxes for so many years.The indoor shopping mall was, initially, a huge convenience. You could drive to one place, park once (usually for free), and visit a variety of shops in climate-controlled comfort (nice in rainy/winter seasons or hot summers). Most people found this preferable to driving all over town or even to a central downtown or shopping district, hunting and paying to park on the street or in a remote garage, and having to walk from shop to shop outdoors. As malls got bigger and bigger, though, the shops became more and more specialized and less interesting to most shoppers. Walking vast distances between the one or two shops you want to visit just recreated the original problem.
Young people used to like to hang out at malls because it was something to do. There was usually a video game arcade and movie theatres, offering entertainment you could not get at home. You could browse shops with friends, and catch up on gossip. Before mobile phones, Facebook, Twitter, etc. you actually had to stay in touch face-to-face and meeting at the mall was easy.
So malls are dying because a) most of them are too big and b) most of the social and entertainment opportunities have been replaced by technology.