What exactly is Rockstar feel these days? Tap A to run? 2004 style mission design? Terrible shooting controls and movement? TBH I think that the only reason GTA games are so succesful these days otther than MP is because a new generation of 9 year old kids will be born from GTA V release through the day VI releases. And that is going to be their first open world game. So they do the usual stuff we did in our first GTA.
And the cycle repeats on and on and on...
I think that GTA is the quarter pounder with cheese of open world games these days: Fills you up, but pretty sterile. Not sure how GTA will make a difference in an era where open world games are the standard. The answer will be of course the massive marketing push a new GTA game will have. But personally, IV was the last great GTA to me. After that game, I much rather play stuff like Just Cause, Saints Row, Sleeping Dogs or hell even Watch Dogs. While they don't have the same budget and polish, I feel these games excel at something in particular while GTA is a jack of all trades.