The problem I see with that at this point in time is... well, it's still new and evolving technology. All sorts of things are still being worked out, gains made in output and mfg processes.....
Competition is working on it, and the rewards will be great for the one(s) that can make it cheap, versatile and durable. Gooberment getting into the mix at this early stage, is just going to screw things up, and possibly lock us into a less than ideal solution, just for political expediency.
Edison had his standard when he went to market selling power generation systems; Tesla followed. For the most part the bracket standards those two men established a century ago continue to be THE standards.
It's pretty obvious that the dramatic reduction in heat offered with LED systems can allow for far better brackets. All we need is a standard.