They won't put in a major thrill ride until attendance drops.
It's backwards if you ask me. Fans support the park, talk it up, and get nothing new. That's why I don't post in here as much and didn't renew my passes last year. BGT is getting the new ride in May with Sheikra. Their attendance dropped, so they decided on the B&M dive machine.
I don't see them doing anything until 2008 because attendance continues to stay hi with the UK visitors discovering the park.