The franchise lucked out with Resurrection just featuring a clone. Ellen Ripley had her time. To lose to the Alien was a realistic and unavoidable ending, thus it was the proper conclusion to her story arc. But, her character went out with dignity and strength.
Any new films should focus on all new characters born after her death, and ones that are not related to, nor resemble her in any way.
Embracing Nostalgia for the sake of money is a good way to screw up a franchise. It's always best to quit while ahead. Ripley quit on Fury 161. I hope the studio respects that narrative choice, lest they should turn Alien into the Terminator franchise.