I don't care for more Rey because she's a one dimensional and boring character, IMO. The only slightly interesting thing about her was the question of her lineage, and the answer to that ended up being dumber than we imagined. I doubt that many watched the sequels because they were interested in her journey. They watched because it was Star Wars and had a supporting cast of characters that they did care about (Han, Luke, Leia, Chewbacca, etc.).
That said, if Disney goes through with it, it'll give them a chance to make her more two dimensional and undo her image as a Mary Sue. Will they do that by giving her the Luke and Obi-Wan treatment and portraying her as a now broken anti-hero who needs to be pushed against her will to do the right thing or will they portray her as a confident and capable hero with a noble passion to rebuild the Jedi order, reinforcing that she's special and doesn't have to face the challenges and lows that other Jedi had to?
It'll be interesting because they'll either give credence to the criticisms by addressing them or prove them once and for all. It doesn't seem like there's much upside in going ahead with it, especially when it's a movie that few want and could underperform, like Solo. I have a feeling that getting to announce it was a gift to Kathleen Kennedy that could easily be taken back the next time that the company changes direction, which seems to happen frequently these days.