I have to say that people are overreacting to it, it requires everyone to agree to use a chain for it to change in any capacity, meaning you could be a single person who would control 90% of it, and if people do not use any changes you want to make, then you wouldn't have it. Everyone acts as if this would be possible but it's not, centralization is not real.
Satoshi thought about everything before he left, he developed it to a point where it would be awesome to handle and wouldn't have these type of problems and that's why we have what we have. If there were any loopholes or issues then someone would have done it long time ago, and it would have been gone already.
whats said in purple was satoshis consensus mechanism 2009-2016
but in 2017 that changed
and that has been admitted by devs that created the bypass..
in 2017 rules changed whereby every user was not required to upgrade to be "activation ready" by august 2017 for an activation to occur
and since then users have not needed to be activation ready for other things to be slid in..