At what point in the future will fate be certain?
Take into consideration that there is no fate; No outcome can be pre-determined with 100% accuracy.
Now, consider the opposite.
Technology advancements such as reading the human mind, data storage capacity increasements, quantum computing becoming more common-place, and other technology related to the mind have already occurred.
The question is not if, but when will observing the future of a mind's decision occur, and therefore eventually control of a mind's decisions (fate) on a larger scale begin?