This is just a reply to your post in this thread, I just didn't feel like posting it in there.
I think the 2 Choose Your Legends polls that Nintendo held for FE Heroes will be one of the biggest indicators of which Fire Emblem characters get into the next Smash game. In the first round of it, Lyn was the highest voted character overall, and Ike was the highest voted male character (3rd overall, behind Lucina). Not to mention that there was also some other voting a while ago for what unit we got for free, and Ike won that as well. His popularity is absolutely there so I don't think you have to worry about him getting cut.