It's not quite as simple as that. No park can simply add any ride they want just because it looks cool. There are many problems with the idea of a Tidal Wave style attraction opening at the resort, especially for 2017.
For one, the resort is currently investing quite a lot as it is. A new hotel, new small attractions and ongoing TLC all add up and with SW8 just around the corner, I doubt we'll be hearing of any notable new additions for some time.
Furthermore, there is simply not the demand for such a soaker of a ride. The UK doesn't have good enough weather to make a large water ride something the general public want to ride on an average day. Even Tidal Wave, which operates in the slightly warmer south, can rarely be seen at over a five to ten minute queue (except on very hot days). Indeed, this was one of the reasons behind The Flume's removal. Space is also an issue - where would this type of ride fit in terms of space and theme?
Then there's the fact that these rides require height to generate such a thrilling ride and large splash. Tidal Wave stands at 85ft, which exceeds Alton Towers' maximum height, so a ride like this would not be nearly as big as Tidal Wave and would often be compared unfavourably to it.
As such, I do not think a Tidal Wave style ride or similar could realistically be on the cards for Towers. Whilst it would be nice to see a replacement for The Flume someday, I feel that any new water ride should come in the form of a water coaster such as Poseidon (on which the level of wetness can be altered depending on the current climate) rather than something so wet.
Rides on Dragon's Fury since SRQ installed:
2016: 17 | 2017: 35