Earlier quoted context omitted.
That tax deduction does get smaller every year (as the interest/principal balance changes). The biggest issue I found with owning is that the equity doesn't build up fast enough at the beginning (with a 30-year mortgage), so if you sell after 10 years the costs pile up to the point that you have almost no net proceeds (5% commission, survey/title/transfer tax/inspections, plus prorated property taxes). A 200K propert…
I would argue in the current situation of 3.5% mortgage rate, the best scenario is to invest the cash in the stock market. If your returns are anything above 3.5% over the 30 year load amount, you're good.
Let's say after 30 years you have a big bag of money. Well, now you have to invest it for the passive income to continue paying rent. But, per my recent comment[1], inflation-protected passive income will pay something like 2.1%. Oh, and you're taxed on the interest income. So, more like 1.7-8% (in addition to whatever hit it because you couldn't put it all in tax-deferred retirement accounts). I hope interest rates return to something sane, but we can't assume that.
In contrast, if that extra money paid off a house, it's implicitly "paying your rent" ... except that it's not an actual income flow, so it's not taxed at all! You just pay property tax, whose increases are capped because you're just an elderly person whose estate shot up in value.
Plus, factor in rentals being generally targeted a lower-income people (or high-income yuppie singles) and therefore less desirable neighborhoods and less optimal for your lifestyle and it's looking steadily worse -- definitely need more than 3.5% for the break-even point (which would have to be the real, not nominal return anyway).