The SALT tax cap in the Trump-era tax reform was both progressive (less state subsidies for property taxes on high-value homes), and hit Democratic-leaning states harder (since they tend to have higher home prices). So movement toward a less regressive taxing regime. But I don't expect an across-the-board reduction in the mortgage interest deduction. The same ideological components to home ownership are at play. And construction is a very large employer as well.