Deckard
Super Freak
Animated is the way to go. You get younger Ghostbusters, the Louis Tulley character in some capacity, they can put Peck in charge of PCOC and the Ghostbusters, and even have nods to John Belushi or John Candy ghosts. And of course they can cater to the 3d gimmick.
I also love what the IDW team has done to the comics recently which was introduce the Ghost Smashers. Ghost Smashers was Aykroyd's original concept where they just obliterate the ghosts, and it's a rival team led by Chevy Chase. It would be a great plot for a movie to have that team become an official Ghostbuster team like in the comic and a jumping off point for a new live action movie with a new younger team. You could still have Aykroyd and Hudson cameo in that too.
I also love what the IDW team has done to the comics recently which was introduce the Ghost Smashers. Ghost Smashers was Aykroyd's original concept where they just obliterate the ghosts, and it's a rival team led by Chevy Chase. It would be a great plot for a movie to have that team become an official Ghostbuster team like in the comic and a jumping off point for a new live action movie with a new younger team. You could still have Aykroyd and Hudson cameo in that too.