What if Queen Mary I lived 30 years longer?

In OTL, Mary I died at the age of 42, possibly due to uterine cancer. Let’s say she lives into her 70s and remains childless throughout that time. Do you think she would eventually have her half-sister Elizabeth executed? And who could end up succeeding her if she did? Would Mary be able to stamp out Protestantism in England, or would it be able to rebound after her death? And what other changes could occur from her living longer?