If rent really is lower than the mortgage payment (assuming the alternative return on the downpayment is taken into account, etc) for an equivalent property, then buying is pretty reasonable in most circumstances.
I'm observing rents way, way below mortgages, but it's very location dependent.
When making decisions about where to put my money, I stopped worrying about what other people are going to do and are doing, what the market might do, etc, and instead think what makes _sense_ for me to do. If some expense makes sense for me, offers good value, etc, independent of attempting to prognosticate the future, it probably does for others as well and the investment will probably work out fine. If it doesn't, it doesn't matter, it still made sense for me to do it.
For me, this has meant buying a house when lots of my peers were running scared at what turned out to be the bottom of the housing market, selling one recently, and renting for the moment. In each case, this was just the cheaper and 'sensible' approach. I think people overcomplicated this stuff.