@o-chan:
It's not about if "they care" it's more about how movie acquisitions have changed in the last 2-3 years and there's a faster turnaround overall (across all NA companies) to get a theatrical showing and commercial release of a movie. For example earlier this year I was able to to see Dragon Ball Super: Broly, Modest Heroes (the Ghibli spin-off Studio Ponac), Fate Stay Night and Gundam NT ALL within the first two months of this year. NA anime companies are more invested in releasing the movie versions of their properties within a year window of the Japanese release and that window has been getting shorter. With One Piece Stampede getting clearance in other countries it's going to be VERY telling if it doesn't get a NA release. It's not about the quality of the movie, or if people are interested but it IS the newest One Piece hype property in Japan and if Funimation doesn't act on it then it's given us a very clear statement on the status of the property in Western shores overall.
In the case of Gundam NT and Fate/Stay Night those two movies were released directly by the companies that made them, which is why they were released so fast in the US. In the case of Gundam NT, Bandai Visual commissioned the dub themselves and it was released on Blu-Ray as an import, no US based distributor has the license to it (making it difficult to find it for a reasonable price on Blu-Ray).
If there is announcement for Stampede (as well as more episodes for the main series) it will likely be in October to coincide with the 20th anniversary. Which maybe part Toei's doing, since Funimation is hyping the 20th anniversary on their site, as well as Toei's history of being more hands on with their properties when dealing with foreign distributors.