I didn't really like her as Gwen. I'm kinda hoping they go the classic route, kill her off, and bring in somebody with some base acting skill. As to whether or not they keep her... I don't know. I doubt I'd actually watch a sequel to this movie anyway. It just wasn't interesting enough for me to pay to watch a sequel.
My main issue is that it's supposed to be a trilogy. That means they'd probably have to kill Gwen at the end of the 2nd. Bringing in MJ and making her seem like the love of his life with all the aftermath of Gwens death, Parkers transformation into a real superhero etc. just wouldn't be enough imo.
There's plenty of other good movies for you out there.