Based on the current Nominal Treasury Yield Curve Rates and Real Treasury Yield Curve Rates, the expected inflation rate over the next 30 years is 2.26% per year.You can solve for the expected inflation rate using the following formula. Nominal Rate - expected inflation rate equals real rate. If the inflation rate is only 1% a year then the investors who own the thirty year bonds will realize a real return higher than what is quoted on6/17/2021.

https://www.treasury.gov/resource-center/data-chart-center/interest-rates/Pages/TextView.aspx?data=yield