If and when we reach the point where 95% of the blocks published in the last 1000 have the new block version number
That is, if someone with commit access doesn't change the requirement to, say, 60%. Because good reasons and won't you think of the children.
Why the hell would someone do that? Nobody wants a fork that can be attacked. We don't want it to happen until you and those who agree with you can be safely ignored.