First off, I'm the XO of an online group that has gamed together for 20 years now, so when it comes to supporting units/team/clans/groups, I'm generally all for it. Tags to designate affiliation, base/housing for the unit to hang out, store resources in and do crafting at, hang trophies, all that stuff, I've played many games with these things and I've played many without them.
One thing I've noticed in all the online multiplayer games is that regardless of the OFFICIAL support provided, or not as the case may be, units/teams/clans/groups WILL form up and they WILL game together. Elite Dangerous has this already, Fuel Rats, Hutton Orbital Truckers, Mobius, and many more besides them, all working together without requiring anything in game to make it happen.
David Braben doesn't like clans, he's been very clear on that and his reasoning is solidly based on practical experiences shared by a hell of a lot of people in online games, they are often toxic, polluting the game and creating disharmony for the general player base. You can see that in Elite Dangerous from groups like The Code, they seek out and kill players without rhyme, reason or consent, and they do it because they find it fun, simple as that. THAT is what David doesn't like and that's why this game has so little official support for anything related to units forming. EGX 2014, he's very clear on the subject, he doesn't want that in his game, that's why, end of story. Pirates operating out of a central system and a few systems around, that's fine, that's what he'd like to see, but groups who go all over the bubble LOOKING to cause grief?
Seeing groups like the Fuel Rats have made David realize that not ALL groups are like The Code, they aren't all out to just gank anyone they can and cause grief to other players for grins and giggles, instead, they are formed out of a desire to HELP other players in the game simply because, they expect no recompense, they ask no toll or price, they simply want to help.
THAT has made David rethink this situation, so we'll probably see SOME limited group tools in the future, but don't expect too much. We have very large anti-social groups already, FD is very much aware of them and their actions, and they don't really like the affect it has on the community overall, that kind of negativity is EXACTLY what David hates, so anything they do will be tempered by that knowledge and how it can be abused by them to cause grief to other players.
In that same EGX talk, David does say that eventually being able to build our own stations is something he'd very much like to have, so there's also hope on that front.
Me, I'm inclined to agree with David on the subject when it comes to Elite Dangerous. The unit I'm the XO of for 20 years now, Shadow Rats Marauders, we're pirates, bad guys, scum of the universe, and we make no bones about it. We are NOT anti-social however, we know the importance of being part of the community, not against it, so we don't gank, we don't grief, and we make sure our victims consent to our predation before hand. It IS a video game, it IS a social interaction, and we are all adults who realize what that means, so we make sure to be social and active with the community, not against it. I see a number of pirates in Elite who don't understand this however, they are anti-social, they work against the community, they get no consent and enjoy making people upset for no other reason than to make them upset. THAT is exactly what David hates about teams/units/groups/clans, THAT toxic and negative activity that hurts the community. And the louder they get, the more people they grief, the less likely it is that we'll actually get any tools from FD to support teamwork and groups, because they'll be used to further that toxic activity.