The two outlet malls are crazy busy--the south I-Drive one is routinely the #2 tourist destination in Florida.
Millenia tho geographically close doesn't really "feel" like a part of the tourist area. In any case, it has great occupancy, so stores there seem to be making money, even if restaurants may or may not be.
Pointe Orlando turned itself around about 5 yeas ago by switching from traditional mall stores to more of a restaurant/nightlife spot, sort of what I think a lot of us hoped Disney Springs would turn into. It has slow nights, but is also packed out on weekends or nights when a big convention is in town. BB Kings just opened a second storefront there, so somebody is making money.
Artegon is a mess, but that's because it's still 2/3 empty. Management failure, pure and simple. Give people what they want--like Pointe or 360 do--it would have crowds.
Again, the key to I-Drive's future at the moment is nightlife. The area surrounding I-Drive is changing rapidly--yuppie apartments are popping up like mushrooms. That I suspect is driving this as much as the "adult tourism" market (a target demo abandoned by WDW and left stagnant by Uni). This is very much "the new downtown." And developers want whatever leg up they can get to succeed there.