They can easily make it back through nostalgia. Going off Wikipedia, we're slowly creeping up on the OG show's 20th anniversary. Aniplex can lay low for now by not uploading it for sale or stream for now, letting the populous "forget" about the series for now. In that time, they can find a new actor to play Ed (or recast everyone if that's more feasible), re-record the dub, and sell it in 2023 as some type of "FMA 20th Anniversary Collector's Edition" with an updated dub. Old fans will buy it on impulse because it's yet another piece of FMA merchandise (with extra stuff I would presume), new fans can buy it in good conscious that Vic isn't getting any money out of it, and Aniplex sees money from all the DVD/BluRay/4k BluRay sales. Everybody wins!