I think there is a great chance of depositions proceeding. Judges are inclined to give plaintiffs latitude for doing their own discovery. I imagine those depositions could be very illuminating. Many a murder has been staged as a suicide. In this case we have a POI with a documented history of aggression, as well as a documented history of embellishment and discrepancies about their past. Let the depositions begin!
Based on my own experience as an executor of an estate who has filed a wrongful death lawsuit, I doubt the Judge will allow the case to go forward against all of the defendants because it was ruled a suicide. In our case, we had to get the death certificate amended so it would list a motor vehicle accident. Even then the Judge dismissed two defendants because we couldn't tie them directly to the accident.