Have you walked inside those malls? Many of them have oversized parking lots for Black Friday.
All that pavement because it might get used for a few hours per year?
Dying malls have also been a good source of autocrosses and gymkhana, so add in...50 more hours per year...
Seriously, while not all malls are "dead", they're rarely (if ever) building all-new enclosed malls. We're at an inflection point where there's fewer half-busy malls than the closed and demolished facilities, which was a looming event since the 1990s, when every town got one but they didn't all need one. The indoor mall still works in places that have long bouts of crappy weather; cold weather is one thing, but excessive precipitation dampens enthusiasm and those purchases. Hey, eleven months out of the year, you don't have to fight for a great parking space. But I may visit one about once every year or two at most, way down from the 5-10 visits a year when I was a teenager.
Don't get me wrong, I'm not fan of the "lifestyle center" model with lots of overwrought frippery, limited design substance, overpriced knick-knacks, and a long walk to the parking lots which suck when it's raining. That any mall can thrive and re-invent itself is a good thing, but many of them are declining until the next concept can take over that real estate, and that's how it goes in America.