I think it would not redeem the Academy, on the contrary it would solidify my opinion of them.
Not rewarding Heath's beautiful Ennis, a veritable acting miracle, a whole human life presented over two hours - and then rewarding this?!? I shudder at the very thought. But money talks, so one never knows.
I'd just like to chime in and highlight this sentiment again. This is very close to how I feel about the situation too Mikaela.
I really, really enjoyed TDK and have now seen it twice. Heath was absolutely brilliant at re-interpreting the Joker, but the role itself was nothing in comparison to Ennis IMHO. Ennis remains Heath's real masterpiece and it's clear it took huge amounts of impressively/ unusually strong acting talent to bring Ennis to life the way Heath did. Ennis just seems like so much more of an important character than the Joker (who, afterall is sort of a pop icon character who has been tackled many times by other actors, illustrators and writers... while Ennis has so much more gravitas and Heath was inventing this interpretation of Ennis from scratch.).
The travesty of the Oscars is that it snubbed BBM in general. To me that's the main issue... BBM as a whole.
The Academy has messed up so many times in the past with so many great films going deep into its history (Citizen Kane being the main and most glaring historical error/ snub that can be cited easily), that the BBM debacle was sort of the last straw for me in terms of the Academy's credibility. I see the Oscars, more than ever, as a political thing now.
To me, the urge to even hope a film/ actor will win an Oscar almost seems beside the point now when it comes to the concept of awarding a film/ acting job based on quality.
I'm sure I will watch the Oscars in the future simply for the spectacle... to watch the clothes, etc., but I don't take them all that seriously anymore.
Even several years out now, I'm still very bitter about the BBM snub.
It also makes me so, so sad to think that the Joker may come to overshadow Ennis in the way that the general public will remember and think of Heath. Based on the number of people going to see TDK, it seems like that may come to be the case for the mass public... and might be even more the case if he were to win a posthumous Oscar.