in my opinion we dont need GTA 6. GTA 5 has a lot of potential and still has plenty of glitches that they need to work on fixing before working on a new game.
At this point - not that much anymore. I was kinda hyped when there were leaks about it, but considering that it'll take at least an extra year or so, just kills the hype (at least for me). Of course, the longer they work for it - the less bugs will occur.