Here's a wild bit of speculation...This article
quotes David Walliams mentioning a "Gangsta Granny Alton Towers ride" in some Britain's Got Talent related thing. Now of course it could just be something that he spontaneously made up in the context of the conversation, although something about Simon Cowell asking "Why do you think you got that?" seems to make it sound more true. What's somewhat curious is that that section of the conversation doesn't actually seem to feature in the video that's embedded in the article, even though everything else that's been quoted does.
Giving some thought to the Gangsta Granny IP and David Walliams' books (which are targeted at children and young teens) more generally, I could definitely see it being something that Towers would go for, as they're both on brand and also very successful, with film and stage adaptations. So, could we see Cloud Cuckoo Land become 'Walliams World' in 2019?