Well, this is what Mersky said in this interview last summer:
Are there any plans to implement this business model for LotRO or Asheron's Call?
Adam: Not really. In bringing LotRO and DDO over to Asia over the past few years, the games we were competing against over there were free-to-play games. So we saw the power of this model, knowing that we needed to lead in this space, and we wondered how we could do that. Do we port an existing game? Do we make a new game? Then we looked at DDO and thought this game is pretty perfect for this model. The style of gameplay, with small group instanced experiences, makes it easy for us to lock off and allow players to purchase access as they need it. Where as LotRO is a much different, open world with a traditional experience that doesn't lend itself to this type of model...
We've been working on this for well over a year, and we had to really go back and re-engineer the game to work under this model, but to answer your question, we have no plans to do this to LotRO because it's a different kind of game. Quite frankly, LotRO's doing really well in its current situation.
As I said, that was all before they had any real clue about just how successful DDO was going to be. If DDO had been a marginal success, I very much doubt they would have gone through all the trouble to move LOTRO to that model. My guess is that they didn't do it for AC because it's just not salvagable at this point - they wanted to get to that 10 year milestone, but I don't think anyone will be all that surprised when it shuts down. I loved that game, but its very dated graphics alone are enough to keep it from really succeeding at this point.
Khafar