What would happen if the keystone species of hummingbirds were taken out of there ecosystem?

Hummingbird predators would not have a food source, therefore competitive exclusion would occur and there'd be a decrease in hummingbird predators. There would also be an increase in the number of the hummingbird's prey since the hummingbird wouldn't be there to consume them. The absence of the species would mess up the rest of the ecosystem

The world be completely messed up. hummingbird are little innocent creatures.