here is the reference: http://www.superdataresearch.com/blo...-games-market/
For Both WoW and SWTOR, only online micro-transaction sales are reported here, not the revenue from subscription.
The take away number is a global digital sales across all segments (subscription, microtransaction, DLC, ...) in the US in 2013 of $11,766 millions, against $10,582 million last year
Here is a breakdown on where the money went
The microtransaction for pure F2P games are growing by 45% while microtransaction for subcription games is down by 21%.
Seems to me that F2P model is not going anywhere anytime soon.