Harbaugh is notoriously tight to the chest. I don't really believe any source but John Bacon on his happenings. Bacon has insider connections to Harbaugh, has consistently been the reliable and reasonable source of knowledge surrounding Harbaugh (even from the very beginning), and most often he will simply say "no one knows anything". The ESPN types can't go on television and say "I don't know!", so instead they speculate, using the fallacy that everyone must prefer the NFL to NCAA, because it's the NFL.
That being said, I wish Jim would just choose. This media circus follows every. single. season... It's just exhausting. And sure, it sure feels like as long as he is here, he will continue to develop 3*s and 4*s to beat or compete with Ohio State and Alabama 5*s. But if/when he inevitably leaves, I'd prefer having a system in place that can attract 5*s, and your head coach flirting with the NFL every. single. season. doesn't help attract them.
FWIW, this was Bacon's tidbit from yesterday. I can't imagine why anyone in the athletic department would ever make a head coach that just won the National Championship in the highest revenue sport feel not wanted.