It will be forked to a thousand other platforms, including private git repositories hosted locally. That cat is out of the bag and fortunately there's not a damn thing they can do about it
If it's that big of an upgrade, and your primary customers are North American based, why the fuck do you decide first thing in the morning of a weekday is the time to roll that out? Grab a fresh pot of coffee and start that shit at 10:00 p.m.
It's a good thing not just everybody can afford a raspberry pi zero that would be necessary to crack an MD5 in seconds