SOLVED.
Starting from your suggestion, having I a rtl8723be based wifi card, I made a 
simple test:

$ sudo su
# service network-manager stop
# modprobe -r rtl8723be
# modprobe -r rtl8723_common rtl_pci
# modprobe -r rtlwifi
# killall -9 wpa_supplicant

then shutdown: the system halted perfectly. I retryed several time, and
always worked.

So, simply, I made a script in /usr/local/sbin/wireless-stop.sh:

#!/bin/bash
service network-manager stop
modprobe -r rtl8723be
modprobe -r rtl8723_common rtl_pci
modprobe -r rtlwifi
killall -9 wpa_supplicant

then an entry in /etc/init.d/wireless:

#!/bin/sh
### BEGIN INIT INFO
# Provides:          wireless
# Required-Start:
# Required-Stop:
# Default-Start:
# Default-Stop:      0 6
# Short-Description: unload wifi modules
### END INIT INFO
PATH=/sbin:/bin:/usr/sbin:/usr/bin
case "$1" in
        start)
                # do nothing at start
                ;;
        stop)
                log_daemon_msg "Removing wifi modules from kernel"
                /usr/local/sbin/wireless-stop.sh
                ;;
        restart|force-reload)
                # do nothing at restart and reload
                ;;
        status)
                # no mean to ask for a status.
                ;;
        *)
                echo "Usage: /etc/init.d/wireless stop"
                exit 1
                ;;
esac

then, just symlink in /etc/rc0.d (shutdown) and /etc/rc6.d (restart):

# cd /etc/rc0.d && ln -s /etc/init.d/wireless K00wireless
# cd /etc/rc6.d && ln -s /etc/init.d/wireless K00wireless

et voilĂ . Shutdown and restart now works.

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https://bugs.launchpad.net/bugs/1724317

Title:
  Shutdown hangs / no standby - possible Wifi-bug in the kernel

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