On the heels of Zynga's less then stellar IPO performance, this is not hard prediction to make. (Recap: they went out for 1/10th the valuation many hypers in the media had them placed at and then lost 10% of there share value almost immediately.)
If Zynga, the profit generator, couldn't sustain a high price, then Facebook, the profit leach, is not likely to.
Still, facebook does have one thing going for it. That is its semi-insular people networking . The very important lesson of facebook is that game consumers don't want to play with every one else-- they want to play with people like themselves. Facebook provided one good filter for that-- who are your friends and your friends' friends.
There are, I am sure, other approaches waiting to be discovered
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