Considering they are adding more data regularly, with the castles and soon the housing system and the rumors are already flying about the next cap raise, I do not think that outspark will be making any announcements soon as to closing.
Could be wrong though. But, I still see too many times where 2 -3 servers are "Full" on the weekends. So, I know a lot of people still play.
And as far as this forum goes, it will not go away until Entropy decides to make it go away.
But, nothing lasts forever.