Who knows. Europa Park will soon be full as a lot of the land around it has been nature protected to prevent a big 'urban sprawl' of Rust + park.Amazing to see how much land they own though, and that eastern area is basically the size of the main park! Have they ever said what it’ll be used for? A second park? I’d imagine that that’s probably just one investment too big for the family alas.
In a Blooloop interview Rulantica's director Michael Kreft von Byern spoke about how Rulantica should secure the resort for the next 3 decades:
"We saw that our existing strategy of increasing the number of attractions within Europa-Park would come to an end due to a limited area around the park,” says Kreft von Byern. “What you will see soon at Rulantica is the first step in a concept which will take us through the next 30 years.”
If the steady increase in park guests continues on its trajectory they're bound to pass 6 million soon (well okay there might be a little set back currently...), plus Rulantica with its 30 year development plan. More hotels in Rust in the works and potentially the (still in early stages of discussions) Europa Valle holiday village project in Alsace, France nearby boosting the resort further.
So maybe in a few decades the resort might be in a position where a third gate/second theme park could work, and the Macks have future-proofed by securing this land already.