To be honest, I think X-Sector needs a really big makeover... e.g.- New Name, New Theme. I think this because all of the rides are really ratty (Including Oblivion) and old. I know that they are painting oblivion and I agree that that will help its cause, but Submission and Enterprise have to go. Many people dislike Submission because of its uncomfortable harnesses and Enterprise for its dizzyness maker, I just dislike them because they are old. I must have ridden them about 5 times each lol. Im only 13.
Unfortunately for you, others disagree with your opinion. I never rode them myself and I am soon 25. However Enterprise aepshetically fits in Oblivion's curves. Even if they close it to the public due to health and safety, I'd hope they keep it running empty just for the spectable. Make it a really expensive piece of theming.
Most people don't go to Alton Towers often. The admission is expensive compared to other family activities (like walking in fields) and most families won't pay that much money for a day out. As a result a lot of the long-standing attractions will still look novel. Even the coasters.