A huge simplification of the tax code could be achieved by phasing in an increased standard deduction to the point where most of the people who do itemize now wouldn't need to, phase out all itemization, and adjusting the marginal rates so that each percentile of earners still contributes about the same amount. Just do this under the banner of tax code simplification without the goals of changing the progressiveness, raising, or lowering total revenue and hand over the implementation details of how much/quickly to tweak those three elements to some actuaries to accomplish over a 5-10 year timeframe.
CCH INCORPORATED
The other thing that could be done with regards to speeding up elimination of deductibility of mortgage interest (and probably help the economy while we are at it) is to "buyout" anyone currently itemizing with a special refinance offer to an interest rate that will put them under the standard deduction. At 2.5% for a 15 year on the $417,000 max conforming loan, you are below the standard deduction and at 3.25% of a 30 year loan you are barely above it. At that point, the only people being left out in the cold without itemization are those with jumbo loans and presumably jumbo financial resources.