Yea your right but I still believe naruto will be able to use the eye without sasuke around or itachi.. its just a matter of getting the right senju chakra.your wrong, shisuis eye could do watever the user told it to, BUT when itachi gained shisuis other eye , he himself programmed it to activate it to his mangekyo sharingan. so the reason why danzo could use his normally was because it wasnt rigged like the one itachi had. and the reason why itachi done this was for the sake of sasuke and the village , he didnt expect a desperate situation like a WAR.
People are making shisuis eye out to be useless now but I think naruto will be able to use it like danzo did if not better.. especially since naruto has a crap load of chakra.