We should assume the worse and prepare for it , I just don't agree with you practically that doing so preemptively will lead to better security , in fact I believe it will lead to far less security because few will follow such a HF
Did you hear Bitmain's recent announcement about a mining facility that will push their hashrate share up to 80%? Possibly hyperbole, and I'm fully aware too of the temporary nature of hashrate shares, but the status quo is looking decidedly less secure also.
I suspect the remaining well intentioned miners will either accept the BU gruel, and/or accept the inevitable necessity of pre-emptive action. What makes you think Bitmain would honour the 3 difficulty adjustment periods that BU needs to activate it's fork? They've been so incredibly honorable and straight up to now, huh?