I didn't mind Franco as Harry. I did not like the kid they cast as Harry in the Andrew Garfield reboot.
Honestly, Spidey has such a good rogues gallery, I'd rather not see them do Green Goblin again. Norman Osborn, maybe, but just make him the billionaire industrialist for now. Kind of the antithesis of Stark, but an actual competition, not like Justin Hammer of Iron Man 2. Use Oscorp to tie in Otto Octavius, and possibly Venom.
Vulture, Shocker, Scorpion, and now Mysterio (and possibly Sandman?) have been introduced or teased.
Spidey has been a very successful franchise, and has so much potential under Marvel, even with Sony still technically owning the rights. I hope they let the goblins simmer on the back burner for awhile, let some of the other villains play.
Prop wise, I have the dagger Harry had when he was going to kill Spiderman in Spiderman 2. It's just a United Cutlery Knights Dagger. I got mine 20 years ago in a shop on Fisherman's Wharf in San Francisco. So I was pretty excited when I saw it on screen.