Lets Have The Sinister Six In Spider-man 3 & 4

tentacles drowning, their lights(eyes are open/on)

they blink

as they sink their eyes are closed

not to say theres a little sun behind him, so one way or other the octopus is fryed and ready to consumption

Like I said before its up to the director to choose whether or not to put his character away for good which might happen since he will probably just concentrate on Lizard and Green Goblin ll then Venom in Spider-Man 4 so I hate to say it but your right 🙁