the number of mining pools doesn't matter nearly as much as the actual distribution of hashpower. miners can point their hashpower away from a malicious pool at a moment's notice. pool operators who endanger the network will quickly fall from favor. remember ghash.io? hardly anyone else does either.....
got a reliable source for that? cuz the SV/ABC war sort of showed how impotent bitmain is.
not only do they not control half the network, but much of what they do control is probably hosted on behalf of clients. similar to the case of mining pools above, bitmain has much less control than people think. prove otherwise.