"Don't get your hopes up, FF3 for the DS is FF3 in Japan. Not N.A. FF3 (FF6)"
Indeed, which is exactly the reason everyone should get their hopes up. FFVI (FFIII-USA) certainly was an amazing game, but so is Final Fantasy III. Considering your statements, I can only assume you haven't played it.
That's not to say I'm against a port of FFVI for the GBA or NDS, but I would most definitely like to see the only Final Fantasy that hasn't seen a release outside of Japan, finally get the attention it deserves.