Those films could be hits, but then again they have a significant X factors riding against them.
In the case of After Earth, it's M. Night. It's like he's cursed or something. The consistency in his flops is pretty remarkable. And to mess up a sure thing like Air Bender in the very specific way that he did. The Happening was a special kind of failure, it really exposed his vision for the odd, slow, non sense that it could be. I don't know man.
People say the Will Smith factor is a big deal, people forget that Will Smith doesn't have a resume of only hits. If the movie stunk or wasn't all that good, the box office followed suit. AND IF EVER A MOVIE COULD STINK, it's with this director.
I'm also not sure about the nepotism going on with this property. Some people don't like it some people don't care. I wonder if just casting another kid may have been a better decision. But that's just me. I hope the film does well, we need more minority lead projects in the industry.
As for World War Z. Just google most any article about that films troubles and you'll see it has a lot riding against it, much more than War of the Worlds did. It has a big chance of being a bomb. One of those heavily picked on (green lantern) type situations. CGI Zombies is always fickle territory. I think this picture will be the critics Pińata this season. It's just high profile enough to get them salivating.
Both those films have one major thing going for them. A high profile actor in a high concept genre film. If they fall flat(and they both have a good chance of doing so), we'll no doubt get more talk of the June curse around these parts.
Just like with Prometheus.