I am aware that JLD is getting an animated movie early next year, but so are the Teen Titans. As for the live action JLD movie, well that's been cancelled or according to the last report it's dead in the water. Maybe if the animated movie is successful it'll be resurrected.
Swamp Thing had his own movie decades ago, cool character but he isn't comparable to the Titans.
I'll give you Constantine despite the fact that the movie and game were mediocre. He also had his own tv show for 13 episodes.
Cyborg and Raven were former Titans. They even talk about it during story mode. They still count as Titans in my book.
Nightwing is a Batman character, nobody is arguing that, but he's also heavily associated with the Titans as well. Its his team! He's a Titan!
As for Blue Beetle, well they say a picture is worth a thousand words... About two, just to show you Jaime is indeed a Titan (comic and cartoon)...