Disney has been sorta weird on Gargoyles. Things can change though.
With Ducktales* coming up, I can them bringing the IP back as an animated series. And maybe as a testing ground. It helps that the newer execs are folks who grew up in the 80's and 90's now.
*It does help that Ducktales has pre-established Disney characters, and was based on an acclaimed comic series with Scrooge.
A friend of mine, who is a huge fan of Gargoyles, told me what he had heard about why Disney is so reluctant to do anything with the series. I don't know for sure if this is true, it's just what I was told by my friend.
The characters for Gargoyles, including their names, personalities, etc, were created by the writing team of Michael Reaves and his wife Brynne Chandler Reaves. The two of them wrote the majority of the episodes for Season 1 & 2. Then for Season 3, producer Greg Weisman decided that he wanted to take the show in a lighter, more comedic route, as well as taking several shortcuts with the animation to cut costs. Michael and Brynne Reaves disagreed, and eventually walked. The show continued in its new direction under a new writing and directing team. As Mr & Mrs Reaves had predicted, the fans didn't like the changes and the ratings tanked.
According to my friend, The split between the Reaves and Disney wasn't a very civil one, and Weisman is still upset with them for leaving the way that they did. However, due to an iron clad clause in their contracts with Disney, they will receive residuals/royalties for all future things Gargoyles related (DVD/VHS sales, toys, television broadcasts, and of course live action adaptations) regardless of whether or not they're still employed by Disney. Disney, or a least Weisman, doesn't want them to receive any financial compensation for the property, so out of spite they're just going to sit on the whole franchise. Either until the Reaves die of old age or there are a new bunch of executives at Disney who agree that Weisman's aproach to the show was not the way to go.
Again I don't know for sure if this story is true. This is just what I've been told. Take it for what you will.