I don't like that they're on the GBA and not the DS but not because I want a complete remake.
I'd like them on the DS because (a) it will be much easier to read the text, menus, etc on the DS and (b) the DS has the proper number of buttons.
It's been questioned on other threads, but is it possible for a GBA game to be programmed to take advantage of the additional buttons (or possibly even the second screen) on the DS?