We were all worried about him not being in Brawl actually. Marth was one of the few characters that wasn't revealed until a couple days before release in Japan. For some reason Sakurai kept him and Wolf super secret from the Dojo and media. We thought that Sakurai just wanted to move on to new FE characters (like Ike) and forget about Marth and Roy.
I'm assuming Marth (with MK mask) and Chrom will be in Smash 4 due to how popular this game is.
Marth also hadn't had two games released recently at the time Brawl was being considered.
He was product placement in melee, and a relic of times gone by. I can see why you'd fear for him then.
But h's iconic at this point, and has had both Shadow Dragon (even though it's awful) and now Awakening in which he's a heavy focal point.
Also that's not Marth wearing the mask. He calls himself Marth, after the Marth of old. Awakening takes place on the same continent several centuries later, so they know of him.
If Marth isn't in the next one I'll eat my hat.
Additionally, I don't know if we'll get Chrom. He's VERY similar to both Marth and Ike, and I feel they'd have trouble differentiating a playstyle for him. They managed it with Ike because they turned Ragnell into a much heavier sword than it is in PoR/RD, he wields that **** with one hand in those.
But Chrom is functionally identical in movements to Ike from PoR. I'd..... be more likely to expect like, the Avatar character, maybe. Not sure if anyone else from Awakening really has a hard claim to it.
The problem I have is I don't see us getting 4 FE characters.
So either they drop Roy in favor of Chrom, or we don't get Chrom. I think we get Marth for sure, and like 80% chance of Ike.