I am pretty sure that in less a Year that Button will do exactly what many YouTuber hope it will do. There has been, specially in the last two Years, so much bullshitting from different Networks that actually some even had to be solved in front of a court that I believe that Google had added it to give those MCN a Chance/a specific Time Frame to deal with their current s**t till Date X or the Channel will get released from their Network.
To be more clear:
I am sure that pressing the Button not only will force a Network to get their a** up but also give them a specific Time Frame (Two up to four Weeks) till when a Channel has to be re-signed to their Network (Accepting a new Invite E-Mail on YouTube) or otherwise will leave the Network.