They just finished building Shanghai Disneyland, which apparently caused a few budget issues in the Parks & Resorts division, so I think you're right about a third US location being off the table for now.

Disney also recently bought out the owners of Disneyland Paris, so they'll probably be putting some investment into that park as well (since it's sorely needed--DLP is considered one of the lesser Disney parks).

Which is a bit unfortunate. I visited it for the first time this year, and absolutely loved it. The Hollywood studios there is very “lightly” themed, but the magic kingdom there was absolutely wonderful. It reminded me of what Disneyland was like in my youth. The pirates land there, as well as the Thunder mountain close are absolutely the best versions that I have seen.

Disney’s been bailing out the French corporation that theoretically owns half of DLP for a while. That structure was difficult to work with, but they also didn’t have the revenue that Disneyland Paris has (where they have a similar structure).

DLP has been consistently underperforming when compared to the other parks. You are correct though, it is one of the most beautiful.

Apart from managerial issues, I wonder if weather has something to do with it (it rains a lot in Paris)

South of France or Spain might have been a better pick but of course there's the issue of access

Only time I went it poured it down solidly - still an awesome childhood holiday and will treasure the memories, but not entirely sure the climate is the best for it.

I have the same trend in mind, however how can we factually know how/why DLP is underperforming ?

They have also spent heavily on the new Star Wars areas and have announced a make over of Epcot. Likelihood of a new park anytime soon is low.