Last I heard, Hyperion were okay financially. So I don't think that's really a worry. If by 'parent company' you meant Amiga, Inc., well there's a certain amount of people in this community who would probably be more interested in Hyperion's OS4 if Amiga, Inc. was dead and gone.
Depends how you define 'survive', doesn't it? I mean you can still use CP/M if you like, so in that respect CP/M has never died :-D. I seriously doubt OS4 will go on to much commercial success though. There was a thread about that whole issue a few days ago.
