Yeah, it's definitely possible. Honestly I think the choices are a little more clear this time than during pre-Brawl, with Ike, Roy, Lyn, and all the others. Right now it seems to pretty much be between Roy and Chrom. And my guess is IS would suggest Chrom. Or a new protagonist... but (as I suspect Sakurai, if he asked, did so last year) I honestly don't see them having a FE14 protagonist finalized enough yet to give to Sakurai, unless they are in fact going to be using Paris. So... that probably helps Chrom's chances I'd say, because unless they are in fact planning a remake of FE6. I don't see them requesting Roy.
I'd totally understand if Sakurai wanted to bypass all this FE speculating and nonsense too, and just let IS decide.