My suspicion is the option to allow installation via a local account (by disconnecting the network) will remain come RTM. They're likely just pressing the issue now to gauge reaction.
My reaction will be to finally bother to install a Linux installation. Sure a lot of people say that then do nothing but seriously after losing my hotmail account and not being able to reach anyone for help and knowing my password and still being locked out I have no plans on creating another Microsoft account.
I can sympathize with losing an old Hotmail account. I had a live/Hotmail account that got locked years ago and it's impossible for me to remember details I used. The accounts linked to the email are very near and dear to me and I still get sad thinking about how ill never be able to login again.
They have already been pushing this heavily in the Windows 10 installer to either “gauge the reaction”, or more likely, to let everyone know that this is coming and there’s nothing you can do to stop it. The time of “gauging the reaction” is over and now it will be the requirement.