Imagine apartments built into what used to be department stores, (Oh, you’re JC Penny 203? I’m at Sears 106). Get those old arcades up and running. Set up meal stations at the food court. Once people actually live there, stores will start to move back in.
If I’m unable to finish my life in my own home, that doesn’t sound like a terrible option.
Yeah the malls themselves are hard to convert. Ditto for those unused office buildings downtown. Takes a lot of work to change commercial space into residential.
Easier to start from scratch, honestly. Those empty parking lots make it simple to put up medium density housing, and then put commercial spaces back into the mall. Aka the Reston Town Center model.