It create the same issue as DFG, everyone who can abuse of lethality buy duskblade and no matter how they hit their spell, even if they miss them all, duskblade will chunk you out regardless.. This item need to go..
Edit: Hell if some champion need some buff after it's removal , it's fine. At least they won't get a free 200 damage for each 1.5 second out of vision... It could use an internal cooldown, getting multiple proc of duskblade is lame.
They need to diversify Lethality items, why is it that Mages have so many AP items to choose from while Assassins are left with 3 Lethality items and a few other AD items that they may or may not use to their fullest potential. I agree that Duskblade is very bad design and should probably be removed but they need to give Assassins something in return for it. Even with that broken item existing most Assassins are still irrelevant in competitive play. Should tell you something.
Duskblade is fine as is. Imo we need more lethality items on par with it, not the other way around.
Inb4 assassin mains cry that they need the item to be relevant, even though it kills diversity and it's Riot's job to make sure assassins can be relevant on their own, which is an issue they've ignored for god knows how long.
If we remove this then lets also remove stasis from the game.
No more 
is okay since the nerf. ITs not a must have now, and you really overestimate his damage. As usual someone got his $$ kicked by a draktharr user.
Until supports are brought down to a reasonable level duskblade will never leave. Just buffing kits isnt a solution too, the min they do ppl complain, look how much shit zed was getting until the jungle changes.
It's funny how assassins did good even before lethality was a thing... Lethality together with the 10% heal&shield items should be removed(inb4 im gonna get downvoted for being right about this thing)
As much as I hate Duskblade and think it's a toxic item -
It's been in much worse states than current.
When it was released it was a mini zed ult that did missing hp damage on pop.
Zed with 2 ults was not fun to play against.
This was release duskblade:
Recipe: 
+ 
+ 850 Gold = 3250 Gold.
+75 attack damage. +5% movement speed
UNIQUE PASSIVE: +10 armor penetration UNIQUE PASSIVE: Your next basic attack on an enemy champion applies NIGHTFALL (120 second cooldown). UNIQUE PASSIVE – NIGHTFALL: After 2 seconds, deals 90 (+ 25% of target's missing health) physical damage. If the target is taken down before NIGHTFALL dealt damage, the full cooldown is refunded.
Why not just revert it so that it take having more lethality to make it hurt instead of it going onto any AD assassin fighter and doing the same amount of damage.
Personally, I feel Duskblade is even worse than DFG in some respects: when DFG was removed, Riot buffed specific mages who built it, because they expected them to be overly reliant on the item's synergy with their kit, but it turns out most of them had robust enough fallback options to not need that much compensation. By contrast, when Riot nerfed Duskblade a little while ago, and compensated champions who built it, that compensation was indeed needed. Therefore, Duskblade creates even more dependency upon a single item than DFG did. On top of that, whereas DFG at least worked by amplifying a champion's existing burst, Duskblade gives front-loaded burst to anyone who builds it, which has incidentally caused a ton of non-bursty champions, namely some fighters and marksmen, to deal far too much upfront damage. There's a whole lot of front-loaded burst on items that needs to be taken out of the game in order for it to become healthier, and Duskblade is one of the prime culprits.
As a side note, it's also worth mentioning that the upcoming changes to armor pen are all the more reason to take another look at Duskblade, and Lethality in general. Assassins were initially given more flat armor pen to compensate for the loss of base armor pen on LW, but now that we're going back to pre-rework levels of total percentage penetration, the sheer amount of flat pen and AD burst in the game right now means AD assassins are going to be at a high risk of shredding through tanks, or otherwise reaching absurd amounts of anti-armor synergy.
As a support player I kinda wish it had it's old passive back but they changed it
instead of you auto a guy, and then after a 2 second delay they take % missing health dmg, make it you auto a guy, and for like 3 seconds, shields and heals cast on them are like -75% effective. No bonus damage or anything.
Right now it actually kills item diversity because you want to deliberately rush this item above all other lethality items because it's the only one who's unique passive that gives more raw burst damage (aka it does more dmg than the other lethality items). This change would make it the "oh they have an soraka who's countering me I better build this item" or "oh they have a thresh so I don't care about this item lemme go for the edge of night instead".
Right now it's basically "we made k6 the strongest boi that ever lived" and also "fk you enemy support for actually doing a good job with warding".
