In the end, Duanmu Huai accepted the task. After all, he didn't want the Novice's Village to blow up where it was. Plus... Duanmu Huai wasn't exactly clueless about how to tackle this task.
In fact, in the game, mid-late stage players had discussed this several times - if they had sensed the danger to Novice Planet at the time, would there have been a way to go back and help complete this task.
The conclusion they came up with was... it could have indeed been possible.
Because looking at the entire Doomsday event, even though Chaos prevailed in the end, the Chaos Legion was the least involved. The ones really causing issues were mainly four races: the Green Orcs who loved full-scale invasions (WAAAAGH) across the continent, the digging Ratmen, Necromancers who planned on ruling the world with death, and Vampires rallying under the flag of the Empire.