So let us talk about the proposed $500k cap on mortgage deductions. I know many people will be going "pfffft that don't mean shit" but in many parts of the country, like Massachusetts, $500k is the normative price for a decent sized family home in the 2nd tier suburbs with the prime city and 1st tier going for much higher than that.
If, and this is a BIG if, this tax proposal goes live then I forsee a big delta in home prices and sales right before it takes effect as everyone tries to 'trade up' as high as they can get and still secure that mortgage deduction and then values drop off a small cliff right afterwards for any property valued north of $500k. This could serve as a significant braking mechanism for the out-of-control housing price increases in areas such as this, but that would also serve to dull the financial windfall of home ownership.