Decknique has been gone for years and there hasn't been another popular place of collaboration since then.
Given how political it was, I'd say it fell victim to itself.
To a decent chunk of cardists, being as smooth or original as possible isn't as big of a priority anymore. It's all about putting flourishes on the Wire, or getting that big DVD project with one of the major magic companies. Cardists lie to themselves and other people refuse to criticize constructively.
And here we come across one of the major problems. It's been commercialized (sort of) so now everyone wants the get-rich/famous-quick route of publishing a hit DVD or download. You remember some of the guys posting about their videos not getting onto the Wire? Holy crap! A finer bunch of whiny, self-entitled douchebags I have not seen since I peeked into the PUA community after a three-year hiatus. I digress.
Here's how I look at the problem: think of it in terms of evolution. A handful of guys have created these hit DVDs or been hand doubles in a movie or whatever. That was a niche that previously did not exist and they evolved into it. But now, everyone is trying to evolve into it too. Oblivious to the fact that niche has already been virtually monopolized by a handful of guys. They got there first and locked out most of the competition. There's very little room left in that niche.
So if that's the problem, then the solution would be to do what seems counterintuitive. Rather than doing what those before you did, expand your horizons, try new things and evolve into a niche that you create for yourself. No easy feat, but very attainable. Assuming of course that one is willing to do the work.
Robert Greene talks about this in "Mastery." Some of the greatest achievers in history got to where they were by creating a field that previously didn't exist and then dominating it. It is one of several different strategies you can take and by no means the only path to success. However, I've been training myself to think in counterintuitive ways lately, so this is the strategy that I tend to gravitate toward.