After what happened, the NSA will lock down everything and do everything to stop such a leak from ever happening again. The chance that we'll have other whistleblowers with Snowden's kind of scope 10 years from now or later is almost zero. The NSA knows the future of their incredible position of power is being questioned right now and they won't let that happen again.
There won't be another "you have a choice now, it's up to you" moment. If there won't be fundamental changes to our system, we and our children will have to live with drastic consequences. We'll be leading the entire World once again - 180 degrees in the wrong direction.