He announced it a while back, no more ESPN, his last year. Will do more extensive work with RSN home games only. For the same reasons, his family.
Here's his leaving ESPN stuff...
https://www.si.com/tech-media/2017/07/03/dan-shulman-sunday-night-baseball-espn
Wow, staying on topic, Peter Mansbridge looks so different with a beard. He's on Tim and Sid.