On non-interference motors there is no compelling reason to change out the belt on a schedule other than to ensure your vehicle does not leave you stranded at the most inopportune time. It will not damage anything if it does let go, but assume it will always leave you stranded.
Something to think about here is to ensure you know exactly which type of motor you have. While they exist, you must know almost all engines produced in the recent past are interference motors. Do not assume your motor is not. Know whether or not it is a non-interference type. Assuming it isn't will ensure engine destruction on a replacement level. Pay a small amount now versus a large amount later.