I'd like to wait and see what the writing quality is like on FE Switch before I start asking for an Altina game, haha.Probably not. The main plotline of their lives was that they had to flee Daein after Elena was given the medallion by a heron that Ashnard had captured.
They're not going to do a prequel, and that's fine, I'd rather do new things.
If you WERE going to do a prequel though, I'd probably center it on Altina, the first apostle who wielded both Alondite and Ragnell like a fucking badass and sealed Yune away. By far the raddest FE character we've never been able to play as.
She might be better off as a legend than a lord.
Tellius did have a lot of cool ideas with its world, so I certainly wouldn't mind returning if we can get some good writers to work on it.