In this chart, from macrotrends.com, you will see 30 year mortgage rates since 1971. Rates peaked in 1981 at 18.44%. But for the past 40 years, mortgage rates have been generally falling.

I added a red best fit line for the years since 1985 and extended it to see at what point it would hit 0%. If the general trend continues, in about 10 years mortgage rates would be zero.

But it is not possible for mortgage rates to be 0%, because mortgage rates are based on the 10 year treasury rate plus a mark up. The difference between the two tends to be around 1.8%. Even if 10 year treasury rates were 0%, mortgage rates would still be around 2%.

I extended the 2% line in green, to show at what point we would hit 2%, if the trends continue. Given those assumptions, mortgage rates would hit the lowest possible rate around 2024, ending a 43 year trend.