Simple answer; money. There has yet to be a gov't department willing to take on the cost and task of relocating asian aro fry to the wild. Breeding farms can be a thousand miles from the aro's range. Aside from multi-day trips to the aro's range and keeping the release alive, there's also the threat of poachers waiting for the release to occur, piracy in the waterways requiring armed escorts, and enforcement of capture laws after any successful releases.
Other factors affecting repopulation of the species are loss of range area from pollution, human population expansion, over-fishing, damming, agricultural drainage and runoff of ag pollutants, and no oversight agency providing accurate population accessments to gauge recovery efforts.
Keep in mind that the efforts would have to be made with genetically unaltered wild variants. Breeding farms focus on selective breeding practices to promote desireable attributes in colors and patterns. These practices severely limit pure wild-strains available for range repopulation.