Why should local papers use your service when they can ask their readers to send them the photos directly? At least here in Switzerland there are already newspapers doing this.
Or you post the article with a message (like BBC does too) saying "Are you there, send photos etc", go back update the article with someones photo etc.
Yes I know readers will automatically send some photos in, but a live stock library is a really good idea to complement readers photos (and whilst I might send a photo to the BBC, my local paper is pretty low down my list - I appreciate that differs on quality of local though).