Well, what can we say? Subscriber numbers have been dwindling and now it's time for the inevitable: In an effort to keep The Old Republic still floating, it will go free-to-play sometime this fall. There will of course be in-game micro transactions and one has to pay for more advanced features and new content which have yet to be announced.
For a ridiculous spin on the story, here's a quote from Bioware General Manager Matthew Bromberg:
Players want flexibility and choice. The subscription-only model presented a major barrier for a lot of people who wanted to become part of The Old Republic universe.
A barrier for people who thought the game was too uninteresting to pay $14.99 per month.
Source: Swtor.com