Maybe so, but even with that they wouldn't do it so rapidly. As has been stated before, they'd transition this over many any years to a point that you wouldn't really notice it. Let's face it, they're never going to go 'thrill' as a park, but what they can do is add one or two rides or attractions that cater to the more thrill-seeking market.
I feel there needs to be an understanding that a park whom builds a larger ride with a higher height restriction isn't becoming a 'thrill park' or trying to enter the 'thrill market', they're merely trying to capitalise and create a sense of loyalty to their existing clientele. They're evolving and growing up with their audience. For example, look at Sabrina The Teenage Witch (bear with me), that show is merely for children, it's magical and fun... years down the line, Netflix produce The Chilllign Adventures of Sabrina - this is merely a tailoring of the original narrative to match the audience that would have grown up with it, whilst containing elements of the original narrative, characters and themes.
Paultons are doing the same, they're *potentially* adding a more thrilling coaster (although people are getting their hopes up way too much for this) that children can aim to ride, parents can ride with their older teenage children etc., then they can take their younger brother/sister on etc.
I feel this point constantly gets lost on this forum and people think Paultons are sat there all like "We NeEd To BuY a BiG rIdE bEcAuSe We DoN't HaVe OnE!", which is not the case when you're spending millions and millions and millions of pounds on a product.