I would be down for remaking Archaea again for the following reasons..
1. Exactly, Mystery of the Emblem and New Mystery weren't localised.
2. Shadow Dragon wasn't remade enough. Enemy variety wasn't changed, no supports (or at the very least, they could go the Kaga route by adding a bunch of events, talk conversations and making characters relevant to the story), no nods toward Mystery of the Emblem to make the story make more sense and base stats weren't touched at all. The English translation is also outdated as it conflicts with future depictions of the characters.
3. Kris completely ruined Mystery of the Emblem's story. It deserves to be remade again just so the story can be normal again. Another thing is that remakes are meant to add stuff, but there's a lot of stuff that the game could do without such as the training grounds and the most of the returning Shadow Dragon characters since most of them don't have a reason to come back and it doesn't make sense for Marth to encounter all of the same people twice in a row. Weapon weight should also come back since without it, you're just selecting the weapon that deals the most damage.
4. Archanea has a ton of lore and character info only known from interviews and dev notes. There was no reason not to add them to improve the story.