So I'm playing a Magisassin who joined the Dark Brotherhood(He's not an evil bastard, he just doesn't have a problem killing for money... He's not evil, really. He donates to charity, and everything.), and I'm wondering will getting the night mother control of the dark brotherhood(though i'm no where near that part) eventually bring back the order of Shadow Scales? I'm going to help her anyway, because I don't like how Astrid pretty much destroyed the rules, and discipline that came with the organization.

But bringing back the Shadow Scale order would pretty much be a bonus for my character.

The game doesn't tell us. But probably not, at least not in any near future. Even with the Night Mother's help, the Brotherhood is still extremely weak - it'll take years before it can recover, right now it has only one sanctuary and painfully few members in it.

Perhaps one day, if DB can restore all its former branches and operate successfully in Argonia, its members will be assigned with the task of creating a new order of Shadowscales. Helping the Night Mother certainly is a step in the right direction. But as of today, with no known Shadowscales remaining, it doesn't look very promising.

Alright. Thank you for the response.

Look on the bright side: your character is an Argonian, you could roleplay a Shadowscale and bring them back yourself!