Not only the file systems are affected
I remember once I had a problem with a Raid controller driver. I tried to contact the author and unfortunately he had died in a helicopter crash. Help was not forthcoming from anywhere, not even from the OS vendor with whom we had a maintenance agreement. So for me, these particular raid controllers died with the author (In the case of Linux).
What this means is that if you rely on community support and it is not available after the author's gone, you're in trouble. At least I understand that this shouldn't happen in commercial s/w. If the author of some software leaves a company, he is replaced and support continues. It's not always the case with Open Source, much as I've come to depend on and love it. :(