Can you elaborate on this? The consequences were mild at best, with people easily duped being duped and twitter having a (understandably) worse reputation.
Think of what this teenager could have done if he had hacked Trump's twitter, or any other current head of state. The best case scenario then is a diplomatic incident, the worst is war or genocide.
But the potential was there. I was providing an all to likely possibility of someone hacking twitter in the way that happened here. Not sure why I have been downvoted for stating something sensible to the question that was asked.