I would be surprised if they did a ride it backwards for oblivion, it hasn't lasted on the swarm and the whole point of oblivion is to see the drop at all times to ratchet up the tension.
Yes, I would have to agree with you. While it would be very interesting and unique experience, I can't see it happening. Oblivion is very nerve-wrecking as it is!
Plus, I just can't see them changing a ride this age, it would cost quite a bit (I presume) and in my opinion, the cost would not be justified in relation to the money they would receive in income as a result of this change, if you know what I mean.