1. Weaker than expected AI.
Great Depression 2.0. Widespread poverty and suffering as the enormous investments already made fail to pay off.
2. AI works as expected.
Dystopia. A few trillionaires gain absolute control of the entire world, and everyone else is enslaved or killed.
3. Stronger than excepted AI.
Hard take-off singularity scenario. Extinction of all biological life.
It's probably hopeless to resist at this point, but we should at least try.