Most games will become F2P from the get go now, there's simply too many out there to go the P2P route. When EQ, XI, WoW came out, they were on their own for the most part, so they could charge people for monthly fees without any issues. Now, just off the top of my head there's what, Tera, EQ, EQII, EVE, XI, WoW, XIV (soon), LotRO, GW2, GW1, RO, ROII, SWtOR, AoC, Aion and I'm sure there's a ton more if I just google an MMO list. That's 15 MMO's, in a genre that's popular, but not overly popular. It's simply too many games with not enough people to go around, so you have to make F2P to even try to get people interested.
Honestly, of all your co-workers, friends, etc, how many do you know that actually play MMO's? Friends, sure I have a couple, but co-workers? A ton play video games, not a one plays MMOs, and they sure as hell don't understand why I do. By friends, I mean real life friends here, not the ones you've met on XI who have become RL friends with.
I get that P2P is the way to go for those of us who were around for the start of these games, I know Catwho, Wint, Thayos etc feel strongly about that and why wouldn't we? It's led to games with great communities that have kept us busy for years. Though, I do think eventually the model will die and be revamped into something else along the lines of what Catwho had mentioned in another thread. The companies have to do something else, cause I still have yet to stick to a F2P MMO (and I've tried several). I simply can't wrap my head around paying for in game items, seeing ads in game, paying a monthly fee but still having to pay for certain other things, it makes no sense!
I do hope XIV sticks with the p2p model, I haven't stuck to an MMO since XI and really want something to play on a consistent basis again. We'll see what happens though, all depends on what kind of population SE is happy with.