I would encourage the SE staff to make dungeons medium difficulty with engaging mechanics instead of just a braindead story telling device. While some people may quit and complain and leave I don't think that would be a big chunk of players and the game would be so much better for it.

I have never seen a game where the difficulty level has killed it. Even games whose hallmark is explicitly being difficult, like dark souls, has its fan base. I'm not saying that should be the goal, however, I fail to see making dungeons engaging and keeping players on their toes all the time makes for a bad game.

I would cast my vote to let the whiners drop out, and make the game an engaging one, they may even attract other players who are looking for a rush or keep the newer ones that quit because they find the game boring. And I have known plenty of people who have bought it, played it, and quit cuz its plain not fun when people just steam roll through the content and leave them behind.

In a harder game they would have to catch that person up because, and this is key, they are needed. And that makes players feel good.

There are ways to deal with players who quit because something is too hard. Such as... Increase the penalty to 3 hours for dropping. That will REALLY make them think before leaving. In their defense however, also add an option to kick for "uncooperative players" and "suspected bot" because there's been instances where a player refuses to listen or maybe doesn't even speak the language and party can't move forward.

And finally roll out the "trust" system to all dungeons, if you wanna play solo, so be it, as long as people who want to play multiplayer get a good dungeon experience where people actually need to cooperate and work together.