I love Oblivion, as a rollercoaster it won't outdate for a long time.
The theme won't outdate for a long time either.
However, the acting in the video does feel a bit too cheesy/early doctor who. The writing for the videos is perfect, just not executed that well. I do remember a time when it was intimidating and slightly scary, but not so much now.
If I was given a large budget to change the ride I wouldn't change the ride, or the seating to be floorless or backwards...I'd re-record all the videos to be a bit more sinister, put in flat screen TV's and extend the tunnel all the way back to the station.
This would give two effects, firstly, as a spectator...once the train drops into the ground...you don't see it re-emerge. And secondly as a rider, it stays dark longer, and you lose your senses.
Lights could be added in a spiral around the bend to make it feel like the tunnel is spinning, or make you feel like you are going upside down.
It would stay dark with the odd flashing light all the way to the station with possible whisper sound effects like... ''did we make it?'' ''are we lost?''
Never going to happen though