Lashtal, again, I mean no disrespect, but I cannot in good conscience let you say something like that without responding. This statement is just plain wrong. Anyone who spends a few minutes online can easily see that.
For instance:
http://duende.uoregon.edu/~hsu/blogfiles/shiller-real.gif
Since WW2, after adjusting for inflation, home prices were pretty much constant in the long run. There were temporary run-ups in the late 1970s and late 1980s, but they quickly corrected back to the long-term trend. There is no good reason to think the current recent run-up will end any differently than those two did. Japan (talk about a place where land is scarce!!) had a big run-up in the late 1980's similar to the one we have now and home prices have fallen there for 17 straight years, to the point where you can buy stuff now for HALF what it would have cost in 1990. So although I admit it is possible to wait too long and miss out on good investments, it is also possible to jump in too soon and lock yourself into bad ones for a long time.
If you want to talk about specific markets instead of national ones, I can tell you that the one I live in (So Cal) absolutely tanked for half a decade in the early 90's. From 1991 to 1996, median inflation-adjusted prices in LA County fell by 31%. Many individual areas fell much more. Thousands of investors went bankrupt and lost all their equity.
Even if prices do always go up in the long term (which itself is not certain), if you are losing money in the short term, you may not be able hold out that long. Look, real estate can be a great investment. That's why we are all here to learn about it, right? :D If you find a good cashflow investment then awesome, go for it! But anyone who thinks that appreciation is going to bail them out of a low or negative cashflow situation is gambling, pure and simple.