The window can't move, as there is an official version of what "open source" means, the Open Source Definition, which does not restrict you from reselling stuff.
We've had "source available" for a long time, which means something else.
I don't disagree that people may still use SA software more as time goes by, but I would argue that when possible people will prefer open source controlled by entities that keep it such.
This is not how language works. The phrase "open source" will mean what people think it means. An organization with a lot of credibility and mindshare can affect that meaningfully by maintaining and explaining the official definition from their perspective, but they can never be guaranteed success in convincing people that their definition is what those words will mean forever.
We've had "source available" for a long time, which means something else.
I don't disagree that people may still use SA software more as time goes by, but I would argue that when possible people will prefer open source controlled by entities that keep it such.