Stuff that would be nice in gta 5
-Being able to open back doors, trunks hoods
-In your safehouse you can cook, use items such as forks, knives, watch tv etc
-Being able to fly all over the world (if they can get a SUPER blue ray disk!!)
-GTA 2 respect system (you gain/lose respect from gangs)
-this may sound far fetched, but it would be nice if every ped could have his own life, family.
-Destoyible building and terrain
-If a car gets destroyed emergency vehicles such as tow trucks and cop cars appear on sight to remove the vehicle and investigate how it happened
-Physiscs that will blow your mind
-Apart from reality, they should keep the old kun concept of the old gta games, not to realistic, and not no physics at all and no great features, in other words, they should balance reality and fun
-Being able to fly into space
-This is kinda of a bad thing to do, but it would be nice to see kids and animals on the streets. Let me expain. Rockstar was gonna put kids in gta 3 beta, but removed it from the full version- reason: you can't just go and murder kids. kids never seem to die. not in video games, not in movies (ok maybe sometime) but it's just to.....erm.....innocent
this is all i think so far