Rizzo and the Lerners don't care about MLB network. Ted Lerner could buy it if we wanted. In 2012, every "expert" on TV howled at Rizzo for shutting down Strasburg. Just now, the Mets have a triple problem: do they pitch Harvey, de Grom, and Syndegaard hard until the end? Boras manages Harvey, and cares about Harvey's full career. Boras says, "no". Syndegaard and de Grom show signs of tiring.
Rizzo made the right decision with Strasburg, with Zimmermann before Stras, and has been cautious with Giolito and Fedde...even though the MLB TV guys haven't yet heard of Little Gio or The Fed, They will, soon enough!
If Williams stays, it will be because Rizzo and the Lerners have decided. Not because of ESPN or MLB TV.