Don't NIntendo fear any "Fire Emblem Fatigue", making it an almost yearly release ? It went from "Make it successful in the US or the whole series DIE" to "So uh, we have this one already finished, can we release it now or do you want to wait an extra year ?"
Oh and Kirby too. Like, sometimes there's like 3 to 5 Kirby games in less than 18 months.
Not really? We've seen a lot of Fire Emblem releases, but they have been different games.
2015 (Japan)/2016 (West)- Fates (Traditional, mainline game)
2017- Shadows of Valentia (Traditional, remake)
2018- Warriors (Muoso spin-off)
2019- Three Houses (Traditional, mainline game)
2020- Shadow Dragon and the Blade of Light (port of the original game, just don't go looking for it on the eshop)
2022- Warriors: Three Hopes (Muoso spin-off)
2023- Engage (Traditional, mainline game)
So we are averaging a new mainline game every four years with a couple of older games surfacing as well as the warriors game. It is almost an annual release situation, but there is decent variety there.
Predictions: We get the long rumored Genealogy sometime in 2024, or 2025 at the latest. After that, we will probably get another game as a GCN/Wii port, unless they hold off PoR and RD for full blown remakes. If not those, maybe a 3DS title gets the treatment. The next new mainline is 2027, keeping with the current pattern. FE: Warriors gets a break since I don't see Engage being worthy of a spin-off.