Should be ending soon since Vivendi wants to give Blizzard the 61% share they have. The only issue is that they are taking with them 5billion$ and Blizzard will still owe them another 400million $ AFTER that...
Rough estimates were putting Asian realms at ~3mil players in 2011 but let's say it's only 1mil and Western wow has 7.6mil active subs:
That would mean 114000000/month or 74100000/month after taxes. Best case scenario and with spending 0 money it would take blizzard what? 5-6months to be on 0... let's say close to 1 year or 1 and a half years in real world before they will start actually earning money back.