If anyone remembers there were XBOX 1, and PS2 modchips which shipped blank, and you had to load the bios onto the chip yourself. PSJailbreak should of been like they if they wanted to get around laws. Then again PSJailbreak people didn't care much about anything other than profit, and wanted close to $200 for an under $20 device.
There was a day though where in the U.S you'd say there's no chance in hell we'd win a case against Sony for a device like this. HOWEVER, with the recent relook at the DMCA by the legal system, they've stated jailbreaking such devices as iPhones, etc is legal. They even defined it's legal to make a personal backup of a dvd you already own, if I recall right. So it'd be interesting with that in mind to see what the court says to Sony, you'd think they'd throw the case right out based on that.
The cats out of the bag though, and Sony cannot do much at all now with source code being out there. All in all, Sony lost, the source codes out, and there's no chance in hell they'd ever be able to stop the sale of usb developer boards. Dev boards have a million uses, and I myself including many use them in robotics.