How many more times will it change? (Score 1)

I no longer have confidence that the game I pay for will be the same game 6 months from now. While every game is an "entertainment experience," I at minimum expect that if I invest my time into pursuing goals in-game, that they will not be made completely obsolete on a whim. Please give me a compelling reason why I should continue to pay $15.00/month if SOE fundamentally changes the game every 6-8 months. To make the game more "Star Warsy" is not an adequate answer, there are tons of games already out there that are.