That is the only "defense" I have seen against that "attack". But it is only wishful thinking about how the users and other players would react.
I bet that, if that "attack" were to happen, 99% of the users would not even understand what it means, or care to know. They would just see the notice "new client release available, please upgrade before 01/Mar/2016", and will comply.
Even the ideological bitcoiners who understand and hate the change would comply, and even support the change; because making a fuss about it would be suicide for them.
Just close your eyes and repeat "om mani blockchain hum, bitcoin was meant to have a 25 M BTC cap, the current cap is wrong". After saying it a few thousand times, hopefully your soul will open and you will see the light.
nah.... I disagree, it would be the end of BTC as we know it, and then it would be something else.
Like many many have said before, try it...