There is a plan to update the current photo upload, but not replace it with Moxie completely. The reason being that media-modules are generally "final" destinations for uploaded media. Moxie is for files that you use often and want to carry around the site and upload to different places. If we do that for, say, Photos - we'd end up with rather confusing two sets of stored photos, with different folders/categories. User just uploads a bunch of photos from an event, shares them and that's see more it. Also an extra layer in the media upload interface is an issue for less savvy users. So, it's more of a UX question. For now, we looking into improving existing uploaders, streamlining upload interface and not connecting Moxie to them.