Presently I am considering various options on how to move forward, and yes, the existing site will continue to exist, but perhaps under a different name. There are some good SEO stats built up for 2012hoax.org that I would like to capture for the new site.

I don't think it will be ditched on the new site, but archived

I think that is a must.

because past failed prophecies are good to keep in order that new visitors, who might be scared about new doomsday predictions, can learn from them and be reminded that the doomsday peddlars always fail

Exactly. The whole site is an example of how genuine science can defeat pseudoscience and fearmongering, and it should remain as an example.

I think it is about time to ditch the 2012 stuff and move on to new doomsday predictions.

I don't think it will be ditched on the new site, but archived because past failed prophecies are good to keep in order that new visitors, who might be scared about new doomsday predictions, can learn from them and be reminded that the doomsday peddlars always fail. I think that should include not just the articles, but existing forum threads and posts as well.

Some articles and forum threads might be relevant re new doomsday prophecies anyway. For example, Nibiru and any claims of a forthcoming "pole shift." I think it's likely that the nutters will attach Nibiru claims to Comet ISON in 2013, as they did with Comet Elenin last year, for a start. In fact, over on Youtube, some claims are already being made about that.