Wow, what a lenthy treatise. I'm winded reading it.<g> Do you want to whisper in his ear that "correlation does NOT mean causation." And then there is the small issue of "scarcity" in real estate.
Five years ago I remember my wife looking at a kitchen and announcing: "This is perfect, honey, but can we hedge it." I responded: "Granite and three standard deviations from the mean overwhelm me!" I believe the granite won out.
A 25-30% drop in R.E. isn't the issue. The issue is from where will the decline begin? And what happens when the dollar soon begins to rise and catches everyone off-guard? How does one factor that in.
As an aside:
We are in Wave 5 of Super Cycle 3.
To quote Prechter: "Why this cycle is so stretched and slow I do not know." Translation: "Why aren't we in a crash phase?" Answer: His count is incorrect. Period.
Question: Ask your friend if the ultimate answer lies in the second derivative of money growth? He's a quant, no?