Since Trump's tax changes very few people itemize - it is very difficult to get about the standard deduction. The average person doesn't even have enough income (the standard deduction is about a third the average income, the odds that someone at that wage level is spending enough on deductible things is small, there are too many non-deductable things they also need to buy).

Of course it depends on where you live - in San Francisco if you can afford a house at all you have enough interest to deduct it (especially at today's rates), but other areas have more sane housing prices and lower incomes.