I agree with this. Even some small small UI changes would really help to improve the community experience. For example, why not at the end of each random dungeon pop up a window (similar to the loot window) that allows you to add any of your party members to your Friends/RealID list, or put them on a blacklist/ignore? The recipient would of course need to agree before becoming RealID friends. Sure it's easy to just to right click the portrait blah blah, etc etc but having a prompt pop up well...prompts someone to actually do it. Will everyone? Of course not, but it's such a simple thing that would surely help. Something else would need to take place in LFR though, as I don't think anyone would be thrilled about having a prompt with 24 names pop up
Similarly, and I'm sure this horse has been beaten to death, there should really be an option to group up with your realm or your battlegroup. This is a bit harder to implement than a simple UI change, but it would really open up some options and let you meet friends closer to "home". It would help to return the sense of community that people long for from vanilla/BC, while adding the spectacular quality-of-life change that LFD introduced in the first place. Longer queue times of course, but better than spamming in trade like you used to do. And at the end of the dungeon, same thing. Prompt to add friends or blacklist enemies.

Beautiful.