I'll bite !
Curious by what you mean by rogue like features? Can you provide an example?
Treasure-> if it can work as the participation collapses, sure (like it doesn't require 4 gods or you can never get a mount, cause it's a pure nude run or something lol).
--My thoughts on your three items:
Wonder: I think all content needs greater variance, starting with some mechanics... where possible.. taken off strict cadence (this is not going to always be possible without destroying the fight, don't do it then). Modify the trash pack make-ups and patrol patterns occasionally, including different mini-boss gimmicks (not complicated boss fights, but like one might draw in and toss, while another does high sustaining aoe damage that enhances each successful interruptible cast completed that cast faster and faster, etc). Add freak events that are even rarer and offer an extra drop treasure at the end of the dungeon. For example in the goblin dungeon there is a chance a group of goblins air drop while you're in combat, even during the boss fight (if you're not below 75% health). Those poisonous like theme'd zones may occasionally have thick miasma, which reduces healing received after taking avoidable damage (and can be lessened by jumping). Make some of these path changing, like you enter the cave to see gunpowder trails- you notice and or already know that in some rooms that the slimes die in fire... Hmm. Leads to a mini-boss with the chance to either drop double boss chest (kill the final boss get double treasure), a unique chest with guaranteed minion / card / music (each person, game will bias to something you DON'T have), or add 25% bonus to the rewards of the run.
Totorak may have an eerie sound where those scorpion spiders start to spawn at the entrance and run to the players, increasing as the dungeon persists.. each boss increasing the rate further... to the point there are like 10-20 coming in endless waves (easy-ish to kill but their damage is not nothing). This may even include minor variations of boss mechanics (don't spend forever to make, but like the patterns can vary or they gain a new spell that functions differently), for example the gobbue that sucks you in may suck in an additional player or at lower health start to devour the hp (regenerate self hp) of the eaten player and RUN from the other surviving players. These new mechanics are not guaranteed, they just change things up (they also throw baby wrenches into addons, and maybe gives content creators more to talk about lol).
Add more potential events in later patches especially, like you can release as is, and every so often the dungeon gains newer potential tweaks. Yes, stop at a certain point lol, but at least a handful.
Fear: ...in short words (explained longer else where), reduce the power creep of gear by going horizontal-lite. If we go deeper, make savage tier gear in the same level of horizontal as the other gear with the pro being more damage BUT less defense (so mistakes are punished more, but your runs are theoretically shorter potentially and damage is a king value). This means dungeon / that kind of easier to obtain gear would tend to have more survive-ability (in that horizontal tier).
Return management choices. Like CC, or like "if I don't do this optional objective the boss will have two side cannons the whole fight and they hit like TANKS". Give TRASH skills that you memorize cause they'll ruin your day, and make you think twice about wall to wall pulls (and require more than just the tank to interrupt). The above sudden events and variations can add to this.
Treasure: Just add a glamour log... lol. I mean I know it's 'just' (not easy), but that would add huge incentive. Add minor variations to important content that is starting to dry up (internal metrics), don't do the dye thing WoW does but for example their top tier PvP / Mythic tends to have some extra minor features. Here you might think "oh cool a plant theme'd armor" and the variation added later has little flapping butterflies on blossomed flowers. Let players extract effects at the cost of X gear, for that glamour log. So you can apply fire to another sword, etc.