If as it appears SW8 has a far lower budget than other SW projects, then I wonder if it is possible that the next few SW could be closer together. For example 3, £6million projects over 4 years, rather than 1 £18 project every 4 years.
The fact that AT has closed some of its less popular attractions could mean a few medium investments to replace them over the next few years.
I could live with a medium investment family wooden coaster, flume and dark ride (but we need a new thrill coaster too).
More regular medium investment options, marketed to the family and family thrill demographic could see gate figures rise year on year to get AT back to where it needs to be.