People will go out to eat, and since they are there do some shopping. There are still things that are better buying in person rather than getting something shipped, not liking it, shipping it back, etc.
Personally I try to buy everything online that I can't walk to and I bought a lot at Best Buy this year. They gave me free wall mount installation from their local location on my television that I bought from their web site and it's nice to have a physical location nearby for bigger purchases in case you need to return something.
In addition, the Walmarts and Targets see an obvious future where you buy things from their web stores online but just have it shipped to their physical locations where you can pick it up during your weekly grocery run. This is already a reality.
There are clear secular trends towards online shopping and against malls but a lot of the shakeout has taken place already and a lot of the weak hands have already left the game. Those that remain along with new entrants are adapting quickly which is why I think the 'retail apocalypse' has already hit the peak of the hype cycle.