The park are currently in the phase of working out what is coming next. There is no solid plan - or not anything they can tell us just yet.
This year was a major development and is Drayton's "Biggest year ever" - The next year or few will see smaller investments as they cannot make major investments every year (Other parks in the Looping family are waiting their turn for their big investments).
However, I am fairly confident the next "Major" investment area will be either our Pirate themed area or the back of the Zoo where the old Thomas Exhibition was as that area has been closed off for some time.
I know everyone gets excited for the next "big" thing, and parks would love to go big every time, but it isn't financially viable.
Also, it may be cheaper to keep a building up than demolish.
Merlin parks have a habit of hiding old buildings / reusing them for storage (E.g the old 4D cinema which is now storage in Alton Towers)
Just know one thing, Drayton are listening. They know what the guests want and what they miss most. For example, they put a memorial down for Apocalypse as they acknowledged how much it meant to guests. Unfortunately, Apocalypse was not able to be saved because it was an end of life ride. It was no longer cost effective to try and repair/maintain with outdated parts. They also know people want to see another dark ride in the park.
But to answer the question. If we see the day where a new dark ride takes the place of Pirate Adventure, I will be there on opening day and covering all aspects of the construction I possibly can.