What does everyone think of Ryu Hayabusa’s chances?
Hard to say. Part of me wants to say he's pretty likely because he's a really cool character, from a series with solid history, and influence, that while not to the level of Mega Man and Castlevania, is still notable.
On the other hand, while we may talk about him a fair bit, not too many of the FP1 characters were discussed in lengthy amounts except Banjo, and Hero after the Brave files were found. Joker was brought up a couple times, but wasn't taken seriously until it happened. Terry was much in the same way. Hero had fans, but it was mostly Sora's gangbangers making noise. And a new Fire Emblem character was both expected (at some point, though perhaps not Season 1) and dreaded by many, for one reason or another. Pokemon's in a similar boat to FE I think.
For Ryu Hayabusa, he has pretty much everything going for him for a character that'd knock people's socks off. Trailer referencing the NES cutscenes? Check. A Ninja rival in either Sheik or Greninja? Check. Tons of moves to pull from with not 1, not 2 but 3 different series? Check. An Iconic song to use for his trailer? That's what 4-2 is for. TWO iconic designs, that wouldn't change animations much? Check.