Statute of limitations might expire in the intervening eight years, and besides, Barry can claim that he de-classified everything that was on Hillary’s bathroom server, Brandon’s Chinatown digs, his garage, or anywhere else. He was the President, after all.
Heir Mueller was able to Extend the Statute of Limitations at the FISA court for Paul Manafort, We can do the same.
So why would he cover for Hillary ?
Who else was using alias email and was not President and could/would provide cover for Hillary ? Who else had enough 'pull' to do that?