The following comes from a Dengeki Nintendo interview with producer Hitoshi Yamagami, director Kenta Nakanishi, director Toshiyuki Kusakihara and producer Masahiro Higuchi.
Kusakihara: Oh? Is it okay to talk about it? Well, the truth is, there was a game we had planned for the Wii after Radiant Dawn, and started development on.
Yamagami: It had me as the producer, and Mr. Kusakihara as the director. It was going to be a real time strategy Fire Emblem game with all sorts of interesting departures from the norm. But, as we approached a finished product, the incredibly picky Mr. Kusahara was not content with it as it didn’t fit the image he had in mind when he played it. While it was incredibly amusing watching him try the product, I don’t think I could’ve reached such a decision so quickly based on that alone. It did show just how passionate he was about the real time system though, but, in my experience, Fire Emblem was always about minimizing casualties as much as possible and thinking about things carefully by the turn. To put together a real time experience in a short time without these considerations and make a judgement based on that was a little premature in my opinion. So, in the end, development froze.