Hopefully, we'd get a little attitude adjustment, question religion more and work together as a human race in the newfound awareness of our place in the universe. Perhaps also work towards actually surviving as a race for a while instead of selfishly exploiting every resource before others do.
It'll revolve around the Native American Experience, hopefully minus the conquest and genocide, more likely as a pattern than an anti-pattern.
In the long run, some high school sports teams controversially named after the aliens, some B-list movies, some academic interest, and that's about it?