Too Long; Didn't Read
According to Mark O’Neill and Paolo Malinverno of Gartner, 50% of managed APIs will support event-driven IT by 2020 (<a href="https://www.gartner.com/doc/3660318" target="_blank">2017 Report</a>). These event-driven APIs will not necessarily replace RESTful request-response architectures, but will become necessary supplements to expand an organization’s functional offerings and overall performance.