How do you predict from trends? Either things will continue on basically the same course, they'll change a little, or they'll change a lot. Zillow's predictions for 2012 were basically it's be more of the same as 2011, and - it wasn't.
In order for home sellers to dig out of the hole, home values are going to have to rise some more, which isn't the best news for home buyers. However, without homes to buy, homebuyers are really just renters.