SWTOR needs about 500k subscribers to be profitable. It is going to be the largest mmo launch ever.. It already has 1.5 million people subscribed for general game testing and pre orders for the game has shattered all records for EA one of the best publishing companies out there. Analysts predict around 3-4 million subscribers after launch. It is based on one of the biggest ips out there, Star Wars. Star Wars alone is far far bigger then Warcraft or Blizzard for that matter. It has been in development for 6-7 years by Bioware, one of the best developers in the video game industry, the same company that created Knights of the Old Republic, argubly the best rpg of the decade and best xbox title for the first xbox generation. Bioware has also devloped numerous game of the year titles such as Mass Effect 1 & 2, Dragon Age Origins etc.
Yes, I think it will be very successfull. People need to keep in mind that 10 million subscibers is not a prerequsitie to success. 500k+ for this game is.