A more interesting direction for future Earth

After the plague upon all cats and dogs, the bird, rat, and other rodent populations would explode. And there would be a food shortage for humans, since too many rodents would be roaming around eating our stored grains. Humans can go extinct or become dumb brutes as shown in the original. The apes should have battled the birds, rats and rodents for world supremacy. And if would be even better if all the birds and rodents acquired the power of speech