NOTE: Sorry in advance for double posting, but I felt like this covered a different topic to my post above, so I thought it warranted a separate post.
Right, I have a slightly controversial opinion that I'd like to share with you all with regards to SW9; in terms of whether the next major year should be a roller coaster or not, I would personally like to see another roller coaster as the park's next major addition, and I'll explain why.
I personally think that if Merlin was to attempt a dark ride at Alton Towers, it should perhaps be done in a medium year instead of a major year. I could see a nice family dark ride done on a similar sort of budget to Hex or Sub-Terra (I believe both were around £4m?) working well, personally; I could potentially even see one in the HoM building being (one of) next year's attraction(s)! The reason why I wouldn't want to see a dark ride in a major year at Alton Towers is because from what I know about Merlin and the way they operate, I could see a high-budget dark ride at Alton Towers being something along the lines of Derren Brown's Ghost Train at Thorpe Park; a very extreme dark ride utilising many scare actors, live action scenes and experimental technology that's only suitable for a small proportion of visitors (over 1.4m tall and 13 years of age). Now, I'm not saying that a dark ride in this style would be a bad fit for the park at all, but DBGT certainly doesn't seem to have been an all-round smash hit in the way Merlin were perhaps hoping for. As much as I hate to admit it, I'd say reviews are mixed to negative and the ride's reliability is somewhat questionable. I'm sure DBGT is a very good ride when it works, but I'm not sure if a similar attraction with similar inherent issues would really be one that Alton Towers would want to invest a lot of money into. To be fair, Merlin may well use DBGT's problems in creating an improved dark ride for Alton, and I certainly have faith in them to produce a wonderful immersive experience after seeing the likes of Wicker Man, but my point still stands. Also, I personally think a dark ride at Alton needs to appeal to all ages, and something like DBGT or Sub-Terra would only appeal to a very limited audience; one that the park's coasters already cover quite well. Furthermore, I don't think Alton are exactly short of dark rides; they already have 2 (3 if you count the Dungeons!). Some theme parks only have 1 and some don't have any at all. Due to the points I've raised above, I would personally rather see SW9 be a roller coaster than a dark ride.
As for water rides, I will admit that a new one would be nice, but my only reservation is that many new water rides tend to be real soakers, and I'm not really sure if the British weather lends itself to an attraction that gets you ridiculously wet. The water rides that get you incredulously wet that presently exist in this country (e.g. Tidal Wave, Valhalla, Battle Galleons) only really tend to be popular on the very hot days in summer from what I've heard, and a brand new attraction ideally needs to have year-round appeal, especially in a country like Britain. One water ride that I could see working well at Alton Towers is a water coaster; a water coaster would fulfill the traditional requirement for an SW ride to be a coaster, it would have quite a wide appeal due to a low height restriction and it would fill the void of a new major water ride for the park. I even believe that some types of water coaster have sensors that adjust the wetness of the splashes depending on weather conditions, which would be particularly good in the UK. I think that one of these would work very well if paired with decent theming; Intamin even unveiled a concept for a full-circuit launched water coaster at last year's IAAPA event, so that would even fulfill the USP requirement!
P.S. Sorry for the long and potentially overly critical post.