Not much. Publicity stunt. He will be rehired soon.
He does have the advantage of intimately knowing about the inner workings of the Iphone, knowledge competitors would love to tap in to, so it would make sense for Apple to keep him around. Do you think his daughter took that into consideration when she was going about potentially wrecking his career?
Samsung? LG? Google?
They all could use an Apple-quality RF engineer!
Very doubtful. Apple has a ZERO tolerance policy for such things.