Gamma Doom is still running around strong and in a lot of cases can still get the job done against CS. Then you have the "New School" EMS build that Jason Hager piloted to a 2nd place finish up in New York. That deck will most likely be the most netdecked deck out there coming into the next few months. I expect some experimentation with the DGL cards that are now tournament legal for Golden Age play to make a small if not noticable insurgance against the CS onslaught. Fantastic Fun IMO is still a great match up against CS as well.
One of the reasons why CS is just so good is that it has the ability to evolve over time, something Teen Titans didn't have. I've played CS for 6 months now and I have to tell you that a lot has changed as far as builds are concerned. It used to be the curve was Boliver, Mark III, Mark II, Mark V, Nimrod, Bastion/Master Mold, Tri-Sentinel with Underground Sentinel Base and Recon Program, Savage, Finishing Move, Cover Fire, etc.
Then people began taking out the Tri's and Undergrounds and throwing in Magneto and Genosha. Then people started taking out their Master Mold's as well and threw in Nasty Surprises and Overloads after lowering their curve a bit... Then we saw MMK released and everyone went Hound happy and you saw the drop out of Mark III and the introduction of Hounds to the Curve. Decks took another slight turn when they started running Total Anarchy, changing the build slightly to a control aspect so that it could easily defeat Titans, Fantastic Fun, and EMS. Then that became unpopular when Micro-Sentinels came into play in place of the Total Anarchy's, this was to stop the Child Name Valeria's, etc. Juggernaut and Mojoverse began to see use to stop Betrayal (which was the first weakness against CS that had been found in a long time), and now most of them are running Apocalypse for an 8 turn curve instead of just a 7 so that they may combat Gamma Doom and other stall decks better then they could before.
As you can see, that's a lot of evolution for just one deck and as long as it can keep evolving, it'll keep winning and keep being popular. I'm all for new deck ideas and new deck concepts, but it's going to be hard to take down CS as long as it has the ability to evolve, it's just too versatile of a deck that it's hard for it not to evolve. I remember when CS finally won it's first 10K event a few months back, the German Hoh piloted to a win in his first 10K win in Europe, since then it's been extremely popular, and now has not just won a few 10K's but has also won a PC, it'll remain popular.