The thought occurs to me that it's possible that Donald Trump, Jr. is being willingly used as the fall guy to cover the ass of his father, Donald Trump, Sr. The e-mails set up the possibility of Trump, Jr. simply saying "I did it but dad knew nothing about it," which would give the Republicans cover for not acting on suspicions about The Donald. "Junior did it. Senior didn't know." That could be the Republican mantra for the next while.
Emails were Clinton's problem during the election, not Trump's.