Now this is interesting. Imran Khan, a member of Kinda Funny Games and a former senior editor of Game Informer, revealed in a recent Kinda Funny podcast that several 3DS games in the works, one of which is another remake of a Fire Emblem game, was cancelled by Nintendo due to middling sales of the 3DS Bowser's Inside Story re-release (that sold only 11,000 copies in the first month. YIKES!). However Imran feels that the remake (as well as the other cancelled 3DS projects) could possibly come to Switch.
The statement in question:
Given that Koei Tecmo did most of the work on Fire Emblem: Three Houses, one has to wonder if the rest of the staff at IntSys was working on this cancelled remake. In addition, the fact that Nintendo cancelled several 3DS projects lines up with what Nintendo president Shuntaro Furukawa recently stated about "bringing 3DS games to the Switch courtesy of the Lite."
Video (time-skipped to the appropriate section)
Article: https://www.spieltimes.com/news/rumour-canceled-fire-emblem-remake-and-other-games-could-eventually-come-to-switch/