In my case, we're a startup with finite time. Adding OpenID support (AFAICT) would take more than 3 lines of code, and very few (if any) of our target audience

In my case, we're a startup with finite time. Adding OpenID support (AFAICT) would take more than 3 lines of code, and very few (if any) of our target audience has an OpenID. Therefore, today, I think it's not a good use of our time. If/when this equation changes (i.e., everybody has an OpenID, or it's trivial to support), I'd be happy to add it.