I wonder how SONY will counter this, i expect a firmware update that will add an additional private key for future software. As for piracy, its worth noting that while firmware private key has been found the private keys used to sign into PSN and to sign games have not been found (and probably never will). As such running custom firmware will allow for piracy/homebrew, however software cannot be signed by the correct private key.
Overall SONY made two big mistakes, they should of used a random number generator with there private key and allowing the bootl to load firmware then verify it(it should verify the firmware, then load it - and it should be locked to loading code from 3 locations[flash memory were the 2 firmware versions are, and 'repair' bit of flash memory for factory repair].
