They're working on multiple technical upgrades already, and some airports have been upgraded. I think better information distribution is one thing. Large craft could have ADS-B (or ATC's view) tracking of a 1-3 mile bubble displayed to them. This would add a check to being blindly told what to do and blindly trusting that others are doing what they're told. You could change certain procedures such as the military having one pilot use NVG while the other not when flying in high traffic and high illumination airspace. No reason we can't add better sensors to planes when you think about all the collision detection we are adding in cars. I'm sure there are many other things that can be changed as well. Some of it's the pace. Stuff that's already been piloted and shown to be effective is still taking forever to roll out at the other airports.