A good positioning piece by Aon on the prerequisites for AI.

I 100% agree that Talent and Infrastructure are critical success factors for an AI deployment. However, while Big data always makes AI more accurate, you can start small and still have some quite staggering results. The only thing I can guarantee is that if you have good AI, it will be adaptive and self-learning. So, if you start small and simple and grow you can improve your time to value much earlier. 

In the AI world, never try to boil the ocean. Trial. error and improvement is the best route to success.