Don’t feel guilty, Daisy. No one knows for sure what is going to happen with housing prices. It seems like a good bet that they are going to keep going down, but something unforeseen could intervene to drive prices up again. For example, the government could step in and bail FBs out or start providing low interest rate loans to first-time buyers or something like that.
No one ever knows for sure what is going to happen, you can only try to gather and process as much information as possible in an effort to guage the probabilities.