How could any leader feel no obligation to address the core issues, or even to acknowledge they exist?
It's unlikely Snowden or Manning will be pardoned, and unlikely we'll see anything other than the most superficial reforms.
I think the bottom line is that in a state that relies heavily on propaganda, the truth is very dangerous, and we'll see an increasing amount of information become classified and stricter and stricter punishments for leakers.
IMHO the most noteworthy aspect of the info Manning leaked was that much of the classified info was simply "bad news" that contradicted the government's contrived story about what was going on in the wars.