I'd agree, it's a structural problem. The mortgage interest deduction is my favorite example. It is a hugely regressive tax break which has been targeted across the political spectrum. Seriously, when was the last time you can remember the Cato Institute agreeing with Barack Obama on tax policy?
But I can't see how it ever goes away: it would definitely increase taxes on voters, so what politician signs up for it? It'll probably turn into a culture war third rail like SALT deductions first.
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.
But I can't see how it ever goes away: it would definitely increase taxes on voters, so what politician signs up for it? It'll probably turn into a culture war third rail like SALT deductions first.