I recently read on FE Wiki that there's a lot of fan speculation about a third game in the "Tellius Series"of Fire Emblem, which includes Path of Radiance and Radiant Dawn, Ike's games.
Fans apparently are thinking it's possible because of Ike leaving Tellius behind forever with Soren/Ranulf. I agree with this, as it's just like Link leaving Hyrule behind at the end of
OoT, which led to MM. All the developers have to do is make Ike and Soren/Ranulf reach a new land, perhaps a new continent with new characters and of course, another sacred object known as the Fire Emblem (unless Lehran's Medallion were to somehow end up in this new land, which I doubt lol).
Another thing, the Wiki also stated that Ike could possibly have gone to Hatari, but this is misleading. It's impossible for him to have gone there because Hatari, after its discovery, was counted as a nation of Tellius, as stated by RD. Since Ike left Tellius behind forever, well, you know the idea.
I can definitely see a good possibility of the developers going fresh and making a true FE trilogy for the first time, as FE needs something like this to gain the popularity it so deserves.
And if they're going to make this third game, I still want Ike and Elincia to somehow end up together...please. xP