Will XAI become the key factor to future Artificial Intelligence adoption?

Explainable Artificial Intelligence (XAI) seems to be a hot topic nowadays. It is a topic I came across recently in a number of instances: workshops organized by the European Defense Agency (EDA), posts from technology partners such as Expert System (here) or internal discussion with SDL's Research team. The straightforward definition of XAI comes from Wikipedia: "Explainable AI (XAI) refers to methods and techniques in the application of artificial intelligence technology (AI) such that the results of the solution can be understood by human experts. It contrasts with the concept of the "black box" in machine learning where even their designers cannot explain why the AI arrived at a specific decision. XAI is an implementation of the social right to explanation."