The biggest factor that needs to be considered in this market is wage growth. As long as wages grow appropriately with the "inflated" house prices, everything is fine. We saw lower than appropriate housing prices relative to nation wages in the beginning of this housing cycle, obviously with the restricted lending guidelines. Those are opening up, which has been great for the RE market. In a capitalistic society people will always over extend....its in our nature.
Don't wait for the next market, you can be profitable in the current if you buy correctly (remember you make money on the buy). It's highly likely that this market will trudge along at a decent rate for years, so if your waiting for a significant crash you might be waiting a while. There will never be a crash like the last one, as economic factors will be different in the next crash, and we have no idea how that will effect the RE industry.
I'm not bullish or bearish on the current market, just taking it for what it is until I see indicators that sway me one way or another.