Personally, and for many family friends who live where I grew up, near a smallish mall that has been dead for over a decade: tons of people. We'd all love to see the space being used, rather than rotting slowly. There was a lot of community activity when it temporarily reopened for a few events and as an indoor walking space (in between events) several years ago.
edit: bulldozing it and putting something else in that place would also be fine, but that costs a fair bit. and really, even just having a big indoor walking space was quite popular, there were several meetups using it, lots of elderly walkers and readers, etc. it was nowhere near as popular as a Walmart of course, but it transformed into a pseudo-public space for a while and it made me realize that "indoor parks" are kinda not a thing, but maybe they should be. particularly in places with a lot of rain or cold.
that, and a big rotting building in the middle of town is rather unambiguously worse optics for the area than even small use. it inevitably gets covered in graffiti and damage, and even minor use prevents that a lot.