Things to keep:
- Heists. Seriously. They were the best part of the game.
- Multiple Protags
- First Person Mode
Things to add:
- Vice City
- Multiple cities but only if we can keep each as detailed as Los Santos
- More stealth options to make stealth a viable way to approach missions. Give us some tools to distract enemies and what not. (I don't even ever use stealth options in games, but the fact that it was there and kind of useless bugged me).
- Make properties a useful way to make money. They were useless in V, unfortunately
- Following that, maybe add something like Vice City Stories's business system. If Vice City Stories played like GTA V, it would probably be my favorite GTA game.
- More dynamic/user driven content. Let us set up some small scale heists at any time. Give us hitman/vigilante missions that spawn a target with different strengths and weaknesses (what can I say, I loved Shadow of Mordor) that we have to take out. Basically, give us rewarding stuff to do outside of Story and Sidequest missions
- Keep expanding GTA Online so that it includes Liberty City, Los Santos, Vice City. If you can eventually get San Fierro and Las Venturas in there, do that too.
Totally my own opinion:
Bring back the feeling of "taking over" the city. I feel like that's been missing since Vice City and San Andreas.