CAs will not arbitrarily throw out their root certificates (they're quite expensive and valuable), so you'll be fine pinning to a root. I'd advise against it wh

CAs will not arbitrarily throw out their root certificates (they're quite expensive and valuable), so you'll be fine pinning to a root. I'd advise against it when you use OV or EV certificates though, as it'd allow for a DV certificate to still work.