Two weeks left for those trying to go from Windows 7 to Windows 10. The Free Upgrade depends on the OS being current, remember.
Do you think those people who have not upgraded by the 14th will be UNABLE to install and activate from their Windows 7 or 8.1 key?
Notice how I didn't ask about any licensing issues. I already know that answer. :)
Likely the ability to upgrade won't change, if there was time/date detection, we'd already have heard about it.