Actually what I'm saying is correct in a sense...if a MMO has 2m subscribers and then dies a week later because it releases updates that fucks with the system and everyone hates it...it ain't successful.
By your logic, were Blizzard were to make such a huge mistake that they would lose such a large percentage of their playerbase and be forced to close all servers, the only logical position that one could hold would be that World of Warcraft
never was a successful game.
That's well beyond preposterous.
If a game had two million subscribers, it
was successful. If it suddenly loses so many subscribers that it is forced to stop all services, then it
stopped being successful. However, the position that it never was a successful game is simply nonsensical.
More importantly, when deciding if a game is
currently successful, looking at the number of active players is a very good metric; second only to net profits.