They need to figure out a way to persist these games. Either sell them off, or open source them or something. It makes me rage when companies lock in users to a game and shutdown the servers.
Also, it's doubtful that the company would be interested in open sourcing them, because they don't really care about gaming or gamers, they just saw a quick way to make money.
There's nothing wrong with having money be your top priority (to each their own) but in Zynga's case it's obvious that it's their only priority.