It could ruin the whole thing a sequel like ffx-2 which i was dissapointed about. It does have good graphics though. But ff9 could be carried on with aeon like system were you control them. Moving on maybe if they put all the good things out of all the final fantasy games together it could be stunning.
1.eidlons controlled
2.a theme park like in ff7
3. airship systems to loads of countries
4. a good story like ff9
5. Overdrives
6. online