I'm having fun in SWTOR, and I have no problem paying $15/month to play. While I would rather keep the game subscription only (higher quality players IMHO), I understand that the game has to go f2p to generate more revenue. More revenue means more content can be created.
I love SWTOR, and I want whatever it takes to bring me more story. I'm waiting for Chapter 4 on my Trooper. I am working on my Agent. I have many other classes to play. When I get them all through Chapter 3, I am going to want to continue on. This requires that the game is making money. If f2p will help that happen, so be it.
However, if the game ever becomes Pay to Win, forget it.
After reading so many comments, I agree.