Based on this documentation:
To enable USB host boot mode, the Raspberry Pi needs to be booted from an SD card with a special option to set the USB host boot mode bit in the one-time programmable (OTP) memory. Once this bit has been set, the SD card is no longer required.
IMPORTANT Any change you make to the OTP is permanent and cannot be undone.
I get this is a one time programmable option. The language is kind of weird so I'm having a hard time understanding the consequences.
My question: If I program this bit to be able to boot my RPi2 with an SSD over USB. Does that mean it will never boot from an SD card ever again?