Wouldn't need to CGI Ripley in if her story was given a satisfying ending. Alien 3 gave her an ending that basically said that if you encounter the Alien, your life is over... figuratively as well as literally. And while that ending may be satisfying for a lot of people, there's likely a lot of people who felt that Ripley sacrificed enough by drifting in space for 57 years and loosing her daughter.
Those same people likely feel that Aliens opened a door for Ripley (along with Hicks and Newt, both fellow Survivors) to have something of a life after their run-ins with the Alien and that something of a life would involve closure on the Alien as well as Weyland-Yutani. And to those people, Alien 5 might be viewed as closure. And if closure was a good enough reason for Amanda in Alien: Isolation, it's a good enough reason for the Survivors in Alien 5.
I want Alien 5... so feel free to lump me in with the 1000 or so people that Gilly mentioned who would be happy with it. At least if Alien 5 gets made, we won't have to worry about a CGI Ripley... because Alien 5 is supposed to give Ripley the closure that Alien 3 failed to deliver for those people like me who want Alien 5.