I'm pointing out the fact that that plot of land could be far more profitable for Disney -- so much so that it would almost certainly justify shutting down Jungle Cruise from a Disney ROI perspective.
That's not really the case for many other Disney attractions; most could only be replaced by a single new ride on the same footprint. That could still potentially increase profitability, but not to nearly the same extent.
Jungle Cruise is almost unique due to the huge plot it occupies. It's roughly as large (and maybe larger) than the whole Frontierland/Liberty Square section of RoA, including all of Tom Sawyer Island. I think Speedway is the only comparable attraction in terms of footprint, but there are issues with developing there that the Jungle Cruise plot would not have.
As I said, I don't think they have any plans to replace Jungle Cruise right now, but I also don't think anyone should be surprised if they decide to at some point for business reasons.