>>16
It is an idea that has already been implemented at the socket level: inetd[1]. It is a system that spawns a specified process when a connection to a port/socket has been opened. No fancy inotify crap.

Also, systemd supports all of this, including FIFOs.[2]

1: https://en.wikipedia.org/wiki/Inetd
2: http://0pointer.de/public/systemd-man/systemd.socket.html