Latest news coming from iOS-> https://techcrunch.com/2016/06/14/apple-will-require-https-connections-for-ios-apps-by-the-end-of-2016/
Anybody from google-drive-sdk support can tell if there is a plan to support https for Realtime APIs soon?
You can run realtime APIs in https URIs. I don't see any problem with that. HTTPS is referring to website security. It's an added encryption layer of SSL/TLS to protect the traffic. So it should be ok.
If you check the Google Realtime API, you can see https is always used.
A Googler even runs his realtime API samples in HTTPS in this video.
Note: Transitioning from HTTP to HTTPS doesn't magically happen. Here's a guide to that. Even local servers are not exempted.