So yeah in general (in-process) crash handling is closely associated with some actor implementations out there. This is really a property of the "local" actors. What would potentially enable this is actually distributed actors stronger isolation requirements (banned stored property access).
Long story short: we are very interested in this topic, but do not currently have any work happening towards this. Improving the crash handling story indeed could be one of the future work with actors and distributed actors, but right now it is not part of the pitch or plan of record.
We can implement failure handling of entire nodes right now with distributed actors of course -- so if you were to implement "a bunch of actors in this other process" and the entire process dies because of a fatal error, we can indeed notice and notify about the crash of all the distributed actors located in that process. We could provide some helpers for that, but that would be a linux/server solution. (Basically like a multi-process transport). In a way this is similar to what XPC can do -- bunch of actors in other process, if process dies we can easily notice that.