@Hotzenplotz
They might enslave us.
Think about what we've done to animals. They're intelligent beings, but less intelligent than us. So we've imprisoned them, we've made them do hard labour, we've eaten them, we've given them a bad case of Stockholm Syndrome and we've worn their skin as clothes.
I'm not criticising carnivores, but when you look at things from that perspective, it's pretty clear that it's survival of the fittest. It always has been.
If we suddenly get pushed down the food chain by aliens who are more intelligent than us, we can't really expect much more for ourselves. You better hope we stay at the top!