That would be kind of awesome I think :).
But companies don't want the "liability" (not necessarily legal liability, but appearances) - and they don't want @thenewh1tler@nike.mastadon or whatever doing unsightly things.
Ya know, like their email servers.
That's the biggest corporate comms use of Twitter anyways, outside "Twitter as support short line" which is honestly both incredibly obnoxious and really unfair to users not on Twitter so I think it's a good thing it might die.