I think this should belong to some more general discussion but couldn't find any open one.
What happends to quest for games that have been shut down ?
for example Dans of the Dragons has been shut down a while ago.
The case will also occurs when flash will be shut down I think.
At the same time, it would be quite unfair to not count the quests anymore for players who completed them ;
and on the other side, keeping them is kinda skewing the ranking since new players and players who didn't complete those quests, will have a rank based on a lesser number of quests.