The castle wall is brilliant as a story-telling & place-making device: the idea being separation of tamed townscape vs wilder nature... venturing out 'into the woods'. As mentioned above and elsewhere, there is a distinct difference in the architectural application (aged, sagging, hyper-detailed vs. clean, straight, gingerbread) of the new & old FL, and the walls help mitigate what could be an awkward clash of styles.
The wall won't be going anywhere in 15 years time, which is a very good thing.
Sidenote of interest: That pixie spinner concept was the same ride as Mater's Jamboree at DCA but dressed differently... it's about 50% bigger footprint than the standard Dis spinner.
The clash of styles is easily rectified by the hills (and trees) of the SWMT area.
We'll just see how long the walls last.
It isn't new knowledge that the pixie spinner is the same as Mater's. That was simply an example. Either way, it would easily fit in the area.