Is the OTW trying to replace all other archives?
No. In fact, we hope that other fans will use our archive software, which will be open-source and free to use and modify, to build their own archives.
In the Archive of Our Own, we hope to create a multi-fandom archive with great features and fan-friendly policies, which is customizable and scalable, and will last for a very long time. We'd like to be fandom's deposit library, a place where people can back up existing work or projects and have stable links, not the only place where anyone ever posts their work. It's not either/or; it's more/more!