I was a big Ed, Edd 'n' Eddy fan back in the day but I don't see any point in bringing it back. It was an episodic show without any recurring storylines, so I don't see any need for it to come back. At least the PPG fought crime and several enemies, so making a new series of them is like making a new Batman or Spider-Man series. It makes sense.
I loved The Mask cartoon when I was a kid. Sadly, the last time it aired on Cartoon Network was back in the late 90s or so. They kept re-running plenty of other shows way into the 2000s, but not The Mask.
I know you're talking about remakes, but I wouldn't mind a new cartoon of The Mask either
I'm surprised Johnny Quest hasn't been brought back yet, by the way. Wasn't it quite popular back in the day?