In terms of a dark ride, I think that there are numerous ways they could get in “new” dark rides without utilising a major investment year. They already have two potential dark ride systems in situ that could both function as new dark rides and really add to the lineup without needing to break the bank.
As for the ride systems (or should I say potential plots) I’m referring to, I’m talking about the site currently housing the Dungeons and the Mack boat ride system and elevators, and the site currently housing Sub-Terra and the ABC drop towers.
Personally, I think it would be really good if the park could take out the Dungeons and put a free-with-entry, family dark ride back into that space, utilising the same boat ride system. I know that the ride system is getting on a bit now, having first been built in 1981, but it’s not a particularly complex system in terms of running costs and has quite a high capability in throughput terms (I believe it can get over 1000pph, correct me if I’m wrong?), so if that were to be turned back into a family dark ride included in park admission, even if it were included as part of TWODW, I think that would provide a major bolster to the dark ride lineup for relatively little money. We shouldn’t forget that they also have the elevators in situ, which might come in handy. They already have the Walliams IP ready to use, so that effectively only means they need to invest in new theming. So in essence, this would give the park another family dark ride without necessitating a major investment year, and it would also give another ride that’s more suitable for a wide demographic within TWODW.
There’s also Sub-Terra. If the park was to either reopen Sub-Terra in some form with the ABC tower systems or do something else filler-y with that space, then that would provide a big bolster to the dark ride lineup. Yes, this would be more of a supporting dark ride than a major dark ride, but it would still provide a welcome boost to the lineup, and if they were to possibly make it more family-orientated than Sub-Terra is/was, then that would still provide a decent new family dark ride experience for the park, again for very little money. They could still keep the FV/military theme, but maybe put something in that appeals more to kids and younger families as opposed to the very teen and adult-orientated ride that Sub-Terra was. It would probably be possible to do this even using the current ABC tower rides, as don’t they only have a 1m height restriction in the Dungeons attractions? (Correct me if I’m wrong there)
If the park did something low-cost utilising both the current Dungeons area and the building formerly occupied by Sub-Terra, then that would give them a total of 5 dark rides, which I personally think is a fair tally. They probably wouldn’t need any more than 5, in my view, especially given that at least 2 of them would have throughputs of 1000+pph.