Few things i don't like about report:
Sources of data:
They are not clearly explained and none of the (cheap) internet media bothered to pay for the full report. So we can only assume they use publicly available earnings figures. Because most of gaming companies are not public though, this means they had to do guesstimates.
Of the mayor MMO subscription based developers, only Activision Blizzard are publicly traded, that's why you never get actual sub numbers for any other MMO.
Trends:
Report covers a time frame that marked a number of poorly performing or overpriced sub MMOs change business plans. Games like that actually caused a drop in sub revenue compared to micro-transactions, sure. But that does not imply a general trend. It only implies you have to produce QUALITY in order to charge a subscription.
Definition of MMO:
Report clearly includes browser based games as well, which are absolutely below standard compared to high budget MMOs. They have proliferated in the last year. So report suggest a lot that browser based cheap to develop F2P showed up on the market. Again, this does not actually spell absolute decline of sub based games, only relative decline as the whole market enlarged.
So maybe the article author could shine some light on those issues?
Well no, they cannot, no one bought the report, but everyone reported about it's highlights (which are free) and made a news story out of that.
We need more quality in web based news reporting as well, especially if it's subscription based.