There is one thing which many of you might forget. The GBA games might run out of battery which will stop all time-based events. Sure, it doesn't effect trade in any way... But some parts of the game might still be affected.
I would definitely love to see RS remakes, no matter for DS or 3DS. If its a new generation or a new game of Gen 5, I'll still welcome it. The only thing which I hope I won't see is either a Grey version or BW3, because seriously Unova is getting kinda boring.