I'm inclined to discount this prediction for two reasons:
1) "Big Video" is all the rage right now in terms of enterprise tech talking points, and, accordingly, perhaps subject to way more hype than it probably deserves at the moment.
2) IDC's other predictions in other areas of enterprise tech are much more extreme than those of their analyst counterparts. (IDC vs. Gartner, Cisco, et al. comes to mind re: IoT predictions for 2020.)