Pro's

• Ability to access personal data of everyone using an apple phone.
• Politicians would either have to stop lying, cheating, sext'ing or switch to an android phone.

Con's

• Thousands of script kiddies in the US will have access to the source code a month before basically everyone else.
• Every country in the world will be able to read all texts, emails, call logs, etc ... as far as damage control goes - this is catastrophic. Every business in the US will have to forbid their employee's from using apple or risk their secrets being used against them. Example - you work sales somewhere, you know your product has some glitches after a recent update - no one has abused it or died ... your tech people are close to solving it - but if anyone knew ... your company is suddenly out of cashflow for weeks or months or forever. There's also weakness testing ... Microsoft once had someone trip over their network cord. They put out a release that their router became unplugged and that's why they were down for 5 minutes. In the press release they were so specific - everyone in the world was like, "what? singular? 1 router? no way they are that stupid?" & most of the world starts pinging the router to see if it was really just one - they weren't being malicious, just curious - but when you get several million hits coming at you - it took Microsoft down for a day.
  
• Note here, companies would also have to forbid employees from using iPhones in their personal life - as any personal secrets which could lead to black mail would be potential threats.

TL;DR: Apple just might go out of business permanently as within the year - anyone in the world can read all apple iPhones. The impact on ignoring the security hole would cause a domino effect of businesses failing if they chose to ignore their employees using iPhones.