Well, while square enix hold the copyright I can tell you that any effort to remake it is totally pointless
Better idea: Port Seiken Densetsu 3 over. SoM was crap compared to it. ((And yes, I've played both)).
I grew up playing SoM (7/8 years old when it came out) but never got to play Seiken Densetsu 3. What made it better in your opinion? In answer to the original question: So long as it doesn't sacrifice gameplay for fancy graphics etc, I'd be all over it.
There is a HD remaster on iOS (and possibly Android) of Secret of Mana, it's really quite good. I hope they release Seiken Densetsu 3 as well, that game was epic.