When RTMP is phased out, what will social media companies use for ingesting streams?

From what I’ve read RTMP is the best low latency solution for sending streams and other current technologies are designed for P2P streaming (WebRTC) and consuming streams (HLS & Dash) (Dash I need to look into more).. Anyways, looks like RTMP is currently the go to for SM companies ingesting streams. What will they do now that Adobe is ending support in 2020?