If the hack results in a jailbreak, I'm sure there will be a patch or a workaround on Cydia. I remember this happening with a SSL issue a few years ago.
Absolutely true. If the hack causes users to trash their old phone and buy a new one, well there's an incentive for the company to NOT fix the hack.
OTOH, if the hack causes jailbreaking and the carrier loses money, now we're talking about terrorists trying to destroy the entire capitalist system.
Incentives are very powerful.