If they just come out and admit they were wrong about everything, then MAYBE, some ppl might accept that as an apology.
As for more intelligent ppl, they have to do much much more than a "sorry".
I think this is the game they basically aimed to create though. So I don't see any apologies coming anytime soon.
There's a lot of things players are suggesting/asking for that get no traction at all. Or at least it seems totally ignored.
Things like expanded subclass trees. Or a more in depth mod system. Other requests include more powerful exotics, armor set bonuses, random rolls, adding another class or subclass, exotic quests, and more diverse loot.
I think a lot of these requests Bungie views as causing potential balancing issues. Everything has been pretty simplified. I just don't see them expanding on the RPG aspects of the game.