Hiashi is trying to hold the moral high ground at the moment, and if he were to use it, he'd be no better then all the heads who came before him.
So he is using his own power to stop the clan from killing him and his family, and if he can take most of them alive, he can trie them for treason, and basically win the moral and generational victory, meaning the caged bird might not have to be used ever again.
Layman's terms: He wins through his own power, the seal is no longer needed because everyone who cares about it is on his side, imprisoned, or dead.
The Uchiha are actually very fine with the whole thing, considering that he now has deprived Obito of a functioning eye.
as for any fanon related stuff... Well... I mean I would go into fanon stuff, but not now.
Let me just say that there are a few who respect Obito's dying wish, and others who do not and want to remove the eye... it just depends on the person inthe Uchiha clan.
As long as Fuguka says it's fine, no one can do a damn thing about it.