My kids download 10 games. They play them all for two minutes. They throw away the eight they don't like. Then they play those last two obsessively for a month. That's alien to those of us who buy a $60 game and play it for 40 or 50 hours. The discovery mechanism is completely social, and I don't think you get that genie back in the bottle.
Free-to-play isn't a business model. Free-to-play is a marketing strategy. It's a way to get people over the hump of trying out your game. It gets rid of the friction that happens when you charge an upfront fee.
