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According to data on WarcraftRealms, MMOData and using the Internet Archive...
7 months ago there were 4 US servers with less than 1000 characters observed by wow census in 30 days, now there are over 40 of these servers, EU is worse, with 60 of them. This is a tremendous downward momentum.
Servers support 25,000 accounts each, there are over 100 servers with less than 4% capacity (based on no characters are alts).
The high water mark of subscriptions, which includes cataclysm release was 12 million, 6 in NA/EU and 6 in Asia.
Total player population observed by wow census now is 1.9 million characters in the US, the last time wow census saw those numbers was Aug 2005 (1.7 mil, next archive is next year with 2.3 mil), and there were 3 million NA/EU subs back then. It looks like wow has lost 50% of subs in one year and one expansion.