I know this is an older post, but I just wanted to chime in...your placenta will most likely move up and you'll be able to have a vaginal birth, but even if it doesn't, you can still have a positive experience.
I had complete placenta previa for my entire pregnancy, had a planned c-section (I had wanted an un-medicated birth), and it all turned out fine, and I am happy with my experience even though it wasn't my first choice. LO was immediately put on my chest in the OR, and I bf in recovery. I didn't have any bleeding or other symptoms during my pregnancy, they just told me to take it easy and not lift anything too heavy or do any high impact exercise, which most people avoid later in pregnancy anyway. So it wasn't a big thing in my case. Can it be an issue? Well, sure...but previa almost always resolves, and even if it doesn't, it doesn't necessarily mean your pregnancy will be complicated or scary. I think that's somewhat rare.