Core can not stop community/miner consensus.
firstly core bypassed community consensus using bip9 by going soft..
Let me see a viable BIP + code first, then we can talk about that.
secondly read bip 9, yep it can be changed. even gmaxwell admits this.
BIP9 changed to a new quorum sensing approach that is MUCH less vulnerable to false triggering, so 95% under it is more like 99.9% (C) under the old approach. basically when it activates, the 95% will have to be willing to potentially orphan the blocks of the 5% that remain(B)
If there is some reason when the users of Bitcoin would rather have it activate at 90% ... then even with the 95% rule the network could choose to activate it at 90% just by orphaning the blocks of the non-supporters until 95%+ of the remaining blocks signaled activation.(A)
^ this is where the UASF comes in (A leads to B leads to C)
secondly you personally know about banning nodes. you have often highlighted yourself as the guy with all the 'know' of the node IP's everyone should ban
its not rocket science