Tor is not the most beloved MMO, by any stretch of the imagination. Most people agree that it going F2P was a sign it was not doing well. Of course, some games going F2P meant they earned LOTS of money, but ToR has a lot of hype to live up to, even now. Another team might want a new SW MMO, and if that happened, ToR might be closed like Galaxy before it.
Now, as much as many people don't like ToR, I know a LOT of people think the storylines in the game are GREAT. When I played, they were by far the best part of the game. When they announced it was going F2P I was excited to see more of them, but hearing some of the restrictions dampened that. That said, there is still the doomsday senerio. If F2P DOESN'T catch on and the game dies, it will all be gone.
Ryan said that the best parts of an MMO are the beginning and the end, and I could kind of see where he was coming from. But in a game like ToR? Where the best part is honestly in the middle? I think losing it would be a huge loss to people who like great stories in games.