I said it in the comments for Part One, and I'll say it again here. They need to reboot Reboot. It's name is literally crying out for this to happen. Update it with modern technology and comparisons to the current way we use computers, play games and use the internet (porn references exempted). Have new characters, a new system, a new style of guardians, new style of game like MMORPGs. It would attract those who liked Wreck It Ralph.
Also, Gargoyles is a amazing idea, going to watch all those old episodes now. Not so convinced on the Simpsons or Harry Potter because I feel we'd need to let the Simpsons rest a little while before we did that and Harry Potter... I've had enough of Harry Potter, unless they do movies based around the first Wizard Wars when Voldemort came to power (maybe actually showing Dumbledore being gay instead of just saying he is and leaving supposed "clues", quit literally a gay witch hunt).