I've been biting my tongue for about two weeks now: "Remote conference" completely misunderstands the purpose of conferences and is DOA. The entire point of a conference is that it's not remote.
The talks portion of a conference, while it may be informative or even entertaining, is there to make it a plausible business expense for everyone to fly out and stay in mid-level hotels.
Conferences are about the "hallway track." I'm dubious that it can be replicated online.