There is now an insecure boot kernel that will disable write protection for the Verizon HTC One M8. This will totally remove write protection allowing for /system read/write capabilities. You might assume that with Permanent Root via the SuperSu.zip changes to the system would stick, but it has been discovered with past devices like the M7 that this is not the case. Once you run the insecure boot kernel all changes to system will stick after reboots. This means you can finally remove all of the bloat on your device once and for all! You will also be able to make other mods like replacing the bootanimation and more which will stick after reboots. Of course you will need to be s-off and bootloader unlocked via Firewater, and you will need a custom recovery like TWRP or CWMR. Head to the link below for the full guide and download links.
Via XDA