Really, if there's no one at Nintendo that has the time or will to work on a series, then said series won't get new games. It's why, as "unpopular" as it may be, Pikmin still gets games, because Miyamoto wants it to. It's why Kid Icarus has kinda gone back into limbo after Uprising, because Sakurai is the only guy associated with Nintendo who cares about the IP and he said he wasn't interested in working on a sequel. It's also why Donkey Kong fell into spinoff hell during the GCN/GBA era, because its main developer, Rare, got sold to Microsoft, and Nintendo didn't really know what to do with the series. I know everyone wants Retro to move back to Metroid or work on a new IP, but I fear leaving DK behind would probably throw the series back into the abyss like it was in the early 2000s.