i few easy things they can do to make the game better as of now

make SH gear trade-able/meld-able
revise stats on NM gear, add crafts to NM drops(lvl 50 versions maybe)
Adjust rewards to dungeons: make gear trade-able, meld-able, add seal completion rewards, add materia drops to chest.

you may not agree with these things but all these ideas would relaunch old content and make it worth doing again.