A "new cause of cell aging" might cause trouble for the somewhat-speculative programme of SENS, the pursuit of long-term "negligible" senescence via regenerative medicine. In this case, if it turns out that telomerase is needed to prevent cellular senescence, it seems you can't use whole-body inhibition of telomerase as a cure for cancer, which is the approach SENS is proposing. It doesn't make all regenerative medicine useless, but it might be a challenge.