It looks like Golden Sun has hit a cross roads, we might see GS4, but what happens after that?
See Golden Sun has a lot of potential for Spin Offs.
As silly as Golden Sun Tennis would be, for some weird reason Takahashi loves making tennis games, and actually I'd be all for seeing our favorite Adepts playing a game of Tennis.
A Golden Sun Prequel is a idea, it could be a game about Saturos and the rest of the Proxians, a game leading up to the cataclysm that started the whole Golden Sun series, the game would have Saturos and Menardi as playable characters, there'd be others, but all we know about them is they don't make it to The Broken Seal, perhaps after defeating the final boss triggers the so called trap that wipes out most of Saturos's men and then we know the rest.
Golden Sun, The Legend of Arceus, Alex, as Alex mentioned, he prefers to work alone, so how about a Zelda like game for Alex, sure he'll have supporting characters and we know who they are, but I'd like to see the Legend of Arcanus.
Golden Sun vs Fire Emblem in a cross over fighting game is another cool idea, I know fighting games are meh, but I think this would be a cool one.
Golden Sun in Super Smash Bros for 3ds/Wii U, Isaac as a Assist Trophy is just the beginning, perhaps maybe we'll see him playable this time, I can't say they'll put a lot of stuff in, but at least put Isaac as playable character, Felix as a costume for Isaac, Alex as Assist Trophy, trophy appearances of some of our favorites such as Mia, Matthew, Saturos, and a Golden Sun stage featuring iconic GS music such as Isaac's battle theme and Saturos's battle theme.
Prequel to Dark Dawn, but sequel to Lost Age, 30 years is a long time, they could work with this with a few prequels for Dark Dawn.
Spin off rpg for Felix, where did Felix go? Maybe he set off on a different quest altogether.
Who knows, maybe just when we thought the Golden Sun series was over, it goes back in time?
Think about it, maybe a time warping cataclysm occurs in GS4 and we are sent back to the beginning, perhaps back to the Saturos quest before The Broken Seal.
Then we see Golden Sun The Broken Seal and The Lost Age remakes.
Except maybe instead of ending at the Doom Dragon, we have to stop Alex.