In addition, they seem to identify Oracle's position more with disability than say, brains.
I can't stop thinking about this comment. I'm so afraid you may be right. I'd add, in addition to brains, that they are ignoring something about Babs' specific personality, too. Like they are fine changing her character to meet some old, regressed role they want to force her into, as when they de-aged her. (And I'm still not ruling out that they won't throw her in a Lazarus Pit soon.)
Hope DC doesn't really equate being Oracle with being disabled, and doesn't think that they can just substitute another disabled character as Oracle, and that they let Babs' personality and character shape her role, versus shoehorning her in, to, as you say, relive the writers' and editors' own nostalgia.
It is so distressing, and especially distressing to think about Cass going away, particularly when she is, as you say, a successful minority character in a legacy role (and someone who also has the whole learning difference angle) AND when they just put her (and Dick) through hellish writing in Beechan's series, blamed poor sales on lack of love for the character, only to end the series with the promise of her being adopted by Bruce soon.
Whoops! Now she's out! I'm going to write DC some more letters today.