I'd be disappointed in the sense that Dark Dawn is the weakest game in the series and we really don't want to be introducing new players to the series with the weakest game in the series.
Ideally what we want is....
A remake/remaster of the first two games together.
A standard rerelease of Dark Dawn. (if only Virtual Console was still a thing)
Golden Sun 4
In that order.
But who is really to say that a reworked Dark Dawn won't be good? I mean, sure the DS game wasn't that great, at least compared to the GBA games because I still enjoyed it lots (especially the combat features). And it would work well with a new coat of paint.
Am not sure why anyone would want Dark Dawn to be skipped over completely.
I mean, imagine we get your situation. Remakes of the GBA games, regular DS quality Dark Dawn, and a sequel... Why would people even wanna touch Dark Dawn? The classics will be enjoyed anyway by the core fans. Remade or not.
That's what made me think of this all you know. We can't move forward without addressing Dark Dawn. And am not sure if Camelot is up to remaking 3 games, and then come with a sequel. Not in the estimated lifespan of the Switch anyway.
What am afraid of, is that we get a remake of the original Golden Sun, and after that nothing. Not even The Lost Age..... Or that we get the one remake of both The Broken Seal and The Lost Age, and after that nothing.
Am quite confident in us getting a Golden Sun for Switch, am more concerned about what they're gonna do afterwards honestly.
Makes me think that it might be even better to just create a sequel to Dark Dawn, and make it grand. Have Isaac lead again, encounter Felix and other old Adepts of the earlier games, fight Alex, fight the Wise One, and deal with that mysterious group Alex traveled with in Dark Dawn (completely forgot their name).