One thing I'd like to add too, is that people always assume Nexon's money grubby. It may be true, it also may be false. But I think if all people look for is the negative, then all they'll find and see is the negative. I prefer to try to see the whole truth if I can, and I think if I assumed everything was Nexon or the employees being money grubby then I think that would be hard for me to see, and hard for them to change, especially if no matter what they do all people will see is "they're money grubby". After all, if everyone but the whales boycott them then they can't change because they still need money. However, if everyone gives them a chance and enough people other than whales spend money, then that gives them the opportunity to change and expand their options, since then they'll have more sources of income to keep the game running. That's what I think anyways.
Game forces you to go to the board to make battles for the first few levels. Force us to use QB maybe for the first "recommended" story boss like or Regina or something?
It's really hard to ignore those slow ass "Blah blah is on sale don't forget to buy..." messages that are animated on-screen. Maybe use that for future recommended QB story-battles and not just random promotional messages.
There's a quest at like level 4 or 5 that teaches you about quick battles. They could move that quest into the start of S3's line and make it required. Would combine well with your idea of forcing QB on the first story raids.
Like make it so when they try to depart for Regina through any means, it'll say:
"Failed to create battle. You do not meet prerequisites. Complete Quick Battle subset story first."
They'll then have to visit the cat who will then explain QB & give them a quest to create and complete a raid QB three times. These three times could be on Corrupted Queen, Twists in Time, and Light and Shadows. This should educate them & get them used to it since the act of creating/completing QB's is a quest objective.