SE hasn't completely forgotten the IP and it pops up in weird places. Brave Exivus allows you to recruit a good chunk of the cast, one of their old browser mecha games from the mid 2010s allowed you to play as Weltall and Brigandier. They commissioned a replica of Sophia's portrait for the 20th anniversary and they even released Kai Art figures of Weltall, Fei, and Elly. Not to mention they're getting ready to drop a model kit collection that includes Weltall, Vierge, Brigandier, and Heimdall. So SE hasn't completely forgotten them like say... Capcom forget Breath of Fire or Konami and Suikoden.