Well they probably will, but the thing is, I'd rather have a new experience of the same thing than to just loop a game I've literally played dozens of times within this 7-year period. Of course I think they could also wait to do the remake and do the 4th one, look at the graphics and data capacity and see if they could do a proper remake after the 4th one
which could also up their sales in a way because then people will be more likely to know what Golden Sun is because this franchise has a loooooong way to go before it's recognized at the level of the Square Enix RPG's. And that 7-year waiting period really does not help at all.