Final Fantasy III and Final Fantasy IV remakes on DS were quite successful. So why not remake some more titles for the system? That is exactly what a Square-Enix fan asked Shinji Hashimoto on Twitter.
Apparently the remake might not be as simple as we may think it would be. Hashimoto replied to the fan’s question saying “For FF5 and 6, there are technical issues as well, so at present these are also undecided.”
I’m not exactly sure what issues they would come across since Final Fantasy IV made quite a smooth transmission from what I understand.