It's interesting that people feel it is a bad thing for Thorpe to go down the thrill market. In response to all those who think it's bad, answer me this: who should they aim at?
Alton Towers is the all-rounder, with something for everyone. Chessington is a family park (though seemingly more focused on families with slightly younger children) with an ever-expanding zoo. Legoland covers younger children and their parents. So, the three other Merlin parks in the UK have pretty much everything covered, but there's nothing really 'for' teenagers and young adults, in Merlin's line up. The UK doesn't have anything specifically designed for that demographic (which is quite big really), and I can't think of anywhere park in Europe off the top of my head where 16-30 year olds are the main audience. So, really, aren't Thorpe filling in a gap in the target market which is actually rather big? And, as Adz said, if this thrill idea wasn't working, it would've been dropped by now.
Thorpe Park have chosen their target market and done brilliantly in advertising to them, catering what they want and are bringing in the visitors, and the money. They are slowly but surely expanding (with the size of the park itself, and the opening of a hotel in the near future). Also, unlike with say Alton Towers, when they advertise a major ride, they haven't had any trouble with the advertising - what you see is what you get, if you will. For example, Th13teen had a fair few bad reviews from the GP because they marketed a family ride as a thrill ride. Thorpe don't need to worry about attracting everyone, so they don't have any issues like that.
As for space, Thorpe have plenty really. The MHFS spot is just crying out for development, and CCR station / general area could even be used for something. There's areas which just have time going against them, Depth Charge, X:\NWO, Saw Alive even, to name a few, which can have new rides put in, if Thorpe want. There's rides and areas which could do with some big TLC, such as Canada Creek and the arena (which, according to the MTDP, will be getting a refurb...), which opens up possibilities in marketing. Then, of course, you've got the two infilled islands (one next to Swarm, one next to the bridge) which will no doubt be used for attractions / coasters, as well as Treasure Island. The MTDP seems to suggest that if a coaster was to go on the island next to Swarm, a fair bit of the layout could be tucked away onto Treasure Island, leaving the infilled island open to flats / other experiences. From what I'm aware, Thorpe are NOT starting any new infill projects until 2016 at the earliest, which shows that Thorpe know they're reaching their limit, something which some councillors showed concerns about recently. In other words, Thorpe have plenty of space, and they have plenty of opportunities to revitalise areas, so as long as Thorpe utilise these opportunities creatively, they really have no problems with regards to space / number of rides.
tl;dr? Thorpe pretty much know what they're doing, have a bit of faith...
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