ShonHarris covered the Guild Fall pretty accurately.

However I should note the site was off for a few months, not weeks. 
And spent a few weeks on an alternate site before this one got up and running.

By that time the majority of members had thought the site was dead for good and left or simply found other communities.
Off Topic and Spam although suffered big blows themselves actually took the least of it, it was mainly the roleplayers who simply start RP's and never bothered to get close with the community or keep informed on Guild happenings that vanished.

Nothing on the site is back to the same strength of how they used to be though, we still have far less members than before.
But the members we do have were at least the more loyal and active ones.