The BSDs we would have wouldn't be nearly as good as the BSDs we now have. There would have been hundreds of forks that never share their code and the core BSDs would have mostly stayed the same. Only the competition with fast evolving Linux made the BSDs progress like they did.
All IMNSHO of course. Without a timemachine it is hard to verify and you can argue about it all day. I just wanted to say that Linux is way ahead of everything the BSDs would have given us and that your argument is BS.